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    • Posted by Nitin Mishra 9 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Manshu Singh 9 months ago

    We have, Area of a triangle by heron's formula= √s(s-a)(s-b) (s-c) Now we know, s = perimeter of triangle/2 So, s=13+13+20/2=23 Let, put the value of s in formula =√23(23-13) (23-13) (23-20) =√23*10*10*3 =√23*2*5*2*5*3 Area = 10√69 cm square

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    • Posted by Sabnam Ara 9 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 9 months ago

    We have given interval is 100 - 120. Here upper limit is 120 and lower limit is 100. Hence, answer is 110.

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    • Posted by Deshu Kaur 9 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 9 months ago

    a = (√5 + 2)/(√5 – 2) b = (√5 – 2)/( √5 + 2) Concept: First rationalize the values of ‘a’ and ‘b’ and then proceed. Formula used: (a + b)2 = a2 + b2 + 2ab (a + b)(a – b) = a2 – b2 Calculation: ∵ a = (√5 + 2)/(√5 – 2) ⇒ a = [(√5 + 2)( (√5 + 2)]/[(√5 – 2)(√5 + 2)] ⇒ a = [(√5 + 2)2]/[(√5)2 – (2)2] ⇒ a = [5 + 4 + 4√5]/(5 – 4) ⇒ a = (9 + 4√5) Similarly; b = (√5 – 2)/( √5 + 2) ⇒ b = [(√5 – 2)(√5 - 2)]/[(√5 + 2)(√5 – 2)] ⇒ b = [(√5 – 2)2]/[(√5)2 – (2)2] ⇒ b = [5 + 4 – 4√5]/(5 – 4) ⇒ b = (9 – 4√5) Now, a2 + b2 + ab = (a + b)2 – ab ⇒ (9 + 4√5 + 9 – 4√5)2 – [(9 + 4√5)( 9 – 4√5)] ⇒ (18)2 – [(9)2 – (4√5)2] ⇒ 324 – (81 – 80) ⇒ 324 – 1 ⇒ 323 ∴ The value of the given expression is 323.

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    • Posted by Raghav Gurjar 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 3 answers

    Anurag Singh 9 months ago

    x+y=8 xy=15, using : (x+y)^2 = x^2 + y^2 +2(x)(y) , (8)^2 = x^2 + y^2 + 2(15) , 64 = x^2 + y^2 + 30, 64 - 30 = x^2 + y^2 , 34 = x^2 + y^2

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    Anshika Choudhary 9 months ago

    x+y=8 xy=15 using : (x+y)^2 = x^2 + y^2 +2(x)(y) (8)^2 = x^2 + y^2 + 2(15) 64 = x^2 + y^2 + 30 64 - 30 = x^2 + y^2 34 = x^2 + y^2

    1Thank You

    Anurag Singh 9 months, 1 week ago

    x+y=8 xy=15 using : (x+y)^2 = x^2 + y^2 +2(x)(y) (8)^2 = x^2 + y^2 + 2(15) 64 = x^2 + y^2 + 30 64 - 30 = x^2 + y^2 34 = x^2 + y^2

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    • Posted by Aditya Sharma 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Abhijit Garai 9 months, 1 week ago

    Let x = 0.999 10x = 9.999 10x - x =9.999 -0.999 9x = 9 x = 9/9 x = 1

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    Posted by Gauri Vikhar ? 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 0 answers
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    • Posted by Akshat Sanghi 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Jasmeet Kaur 9 months, 1 week ago

    ( √ 5 + √ 2 ) 2 = ( √ 5 ) 2 + ( √ 2 ) 2 + 2 × √ 5 × √ 2 [ ∵ ( a + b ) 2 = a 2 + b 2 + 2 a b ] = 5 + 2 + 2 × √ 5 × √ 2 = 7 + 2 √ 10

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    • Posted by Sachin Yadav 9 months ago

    CBSE > Class 09 > Mathematics
    • 3 answers

    Binod Binod 9 months, 1 week ago

    In jee 2024

    0Thank You

    Binod Binod 9 months ago

    Have you cracked because I have received AIR -977

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    Ashis Shome 9 months, 1 week ago

    P(1)=0 P(-1)=6 P(2)=0 P1+p-1+p2=6

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    • Posted by Shreya Singhal 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Abhijit Garai 9 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    • Posted by Krishna Shrivastav 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 9 months ago

    Hence, the cost of painting the triangular board at the rate of 9 paise per cm2 is Rs 2.16​​​​​​​.

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    • Posted by Preet Rajput 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 9 months ago

    In a square A B C D , P , Q , R and S are the mid-points of A B , B C , C D and D A respectively. ⇒ A B = B C = C D = A D [ Sides of square are equal ] In △ A D C , S R ∥ A C and S R = 1 2 A C [ By mid-point theorem ] ---- ( 1 ) In △ A B C , P Q ∥ A C and P Q = 1 2 A C [ By mid-point theorem ] ---- ( 2 ) From equation ( 1 ) and ( 2 ), S R ∥ P Q and S R = P Q = 1 2 A C ---- ( 3 ) Similarly, S P ∥ B D and B D ∥ R Q ∴ S P ∥ R Q and S P = 1 2 B D and R Q = 1 2 B D ∴ S P = R Q = 1 2 B D Since, diagonals of a square bisect each other at right angle. ∴ A C = B D ⇒ S P = R Q = 1 2 A C ----- ( 4 ) From ( 3 ) and ( 4 ) S R = P Q = S P = R Q We know that the diagonals of a square bisect each other at right angles. ∠ E O F = 90 o . Now, R Q ∥ D B R E ∥ F O Also, S R ∥ A C ⇒ F R ∥ O E ∴ O E R F is a parallelogram. So, ∠ F R E = ∠ E O F = 90 o (Opposite angles are equal) Thus, P Q R S is a parallelogram with ∠ R = 90 o and S R = P Q = S P = R Q ∴ P Q R S is a square.

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    • Posted by Chetan Anand Pabboju 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Yuvraj Singh 9 months, 1 week ago

    AB=BC=CD=DA

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    • Posted by Varsha Jadhav 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anurag Saikia 9 months, 1 week ago

    A number which can be expressed in a simple fractional form of p/q where q≠0 is called a rational number. Eg: 1/10, 827/20838 etc.

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    • Posted by Chandan Suri 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Chandan Suri 9 months, 1 week ago

    (i) equation of x-axis is y=0. (ii) equation of y-axis is x=0.

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    • Posted by Chandan Suri 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 5 answers

    Account Deleted 9 months, 1 week ago

    10

    2Thank You

    Rehan Khan 9 months, 1 week ago

    The symbol of rational number

    4Thank You

    Kayna Gupta 9 months, 1 week ago

    3x−5y−7=0 3(2k−1)−5(k)−7=0 6k−3−5k−7=0 k−10=0 k=10 Hope this helps you 😊

    3Thank You

    Kayna Gupta 9 months, 1 week ago

    3x−5y−7=0 3(2k−1)−5(k)−7=0 6k−3−5k−7=0 k−10=0 k=10 Hope this helps you 😊

    3Thank You

    Hem Raj 9 months, 1 week ago

    10

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    • Posted by Aliya Parween 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Aliya Parween 9 months, 1 week ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

    Atul Kumar 9 months, 1 week ago

    KN and LM are equal perpendicular to a line segment AB

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    • Posted by Khushvi Parikh 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Tanvi Bhatt 9 months, 1 week ago

    Let the angles be x and 3x. We know that sum of adjacent angles of parallelogram is 180° x+3x=180 x= 45° 3x= 135° .:. angle A=angle C=45 Angle B= angle D= 135

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    • Posted by Kawaii _ 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Account Deleted 9 months, 1 week ago

    Y=115°; X= 115°; Z= 25° Step-by-step explanation: Y= 180°-65°=115° (Cointerior angles) X=Y= 115° (Corresponding Angles) Z=90°+z+65°=180° = 155°+z=180° Z= 25°

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    • Posted by Chandan Suri 9 months, 1 week ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Kawaii _ 9 months, 1 week ago

    1.(0,-3) 2.(1,4) 3.(-2,-3)

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    • Posted by Chandan Suri 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 5 answers

    Professional Gamer 9 months, 1 week ago

    X axis

    1Thank You

    Dipa Sinha 9 months, 1 week ago

    x axis

    0Thank You

    Arnav Shahi 9 months, 2 weeks ago

    X axis

    0Thank You

    Naitik Gujrati 9 months, 2 weeks ago

    Positive side of x-axis

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    Akshit Gautam 9 months, 2 weeks ago

    X axis

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    • Posted by Usman Gani 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Anubhav Dubey 9 months ago

    This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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    0Thank You

    Kawaii _ 9 months, 1 week ago

    15.2 cm^2

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    • Posted by Anurag Singh 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Dipa Sinha 9 months, 1 week ago

    Sorry mod point theorm

    0Thank You

    Dipa Sinha 9 months, 1 week ago

    Converse of mod point theorm

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    • Posted by Deshu Kaur 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Akshaya Mathi 9 months, 2 weeks ago

    8.5

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    • Posted by Arpit Prajapati 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Saksham Jain 9 months, 2 weeks ago

    All are 75

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    • Posted by Yuvraj Arora 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Md Faiz Ansari 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Sarthak Rai 9 months, 2 weeks ago

    296

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    • Posted by Divyansh Singh Bisht 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Khushboo Seth 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Gargi Makkar 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Harshal Patil 9 months, 2 weeks ago

    (3x+7y)³ = (3x)³+(7y)³+3 × 3x × 7y(3x+7y) =27x³+343y³+63xy(3x+7y) =27x³+343y³+189x²+441xy². Ans.

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    Ritika Burnwal 9 months, 2 weeks ago

    (3x+7y)³ = (3x)³+(7y)³+3 × 3x × 7y(3x+7y) =27x³+343y³+63xy(3x+7y) =27x³+343y³+189x²+441xy². Ans.

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    • Posted by Abdul Aahad 9 months, 2 weeks ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Ritika Burnwal 9 months, 2 weeks ago

    Here given, x= -2 and y=5 So, 2x+my=11 Therefore, 2(-2)+m(5)=11 -4+5m=11 5m=11+4 m=15/5 m=3

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    Aditya Singh 9 months, 2 weeks ago

    3

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