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    • Posted by Nitin Mishra 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Mansu . 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 3 answers

    Anurag Singh 1 year 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 1 year 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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    Anurag Singh 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Abhijit Garai 1 year 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 ? 1 year ago

    CBSE > Class 09 > Mathematics
    • 0 answers
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    • Posted by Akshat Sanghi 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Jasmeet Kaur 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 3 answers

    Binod Binod 1 year ago

    In jee 2024

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    Binod Binod 1 year ago

    Have you cracked because I have received AIR -977

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    Ashis Shome 1 year ago

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

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    • Posted by Shreya Singhal 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Abhijit Garai 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anshika Choudhary 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Yuvraj Singh 1 year ago

    AB=BC=CD=DA

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    • Posted by Varsha Jadhav 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Anurag Saikia 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Chandan Suri 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 5 answers

    Account Deleted 1 year ago

    10

    2Thank You

    Rehan Khan 1 year ago

    The symbol of rational number

    4Thank You

    Kayna Gupta 1 year 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 1 year 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 1 year ago

    10

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    • Posted by Aliya Parween 1 year ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Aliya Parween 1 year 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 1 year ago

    KN and LM are equal perpendicular to a line segment AB

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    • Posted by Khushvi Parikh 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Tanvi Bhatt 1 year 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 _ 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Account Deleted 1 year 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 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Kawaii _ 1 year ago

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

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    • Posted by Chandan Suri 1 year ago

    CBSE > Class 09 > Mathematics
    • 5 answers

    Professional Gamer 1 year ago

    X axis

    1Thank You

    ᴍʀ ᎪຮᏂυ 1 year ago

    x axis

    0Thank You

    Arnav Shahi 1 year ago

    X axis

    0Thank You

    Naitik Gujrati 1 year ago

    Positive side of x-axis

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    Akshit Gautam 1 year ago

    X axis

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    • Posted by Usman Gani 1 year ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Anubhav Dubey 1 year 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 _ 1 year ago

    15.2 cm^2

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    • Posted by Anurag Singh 1 year ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    ᴍʀ ᎪຮᏂυ 1 year ago

    Sorry mod point theorm

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    ᴍʀ ᎪຮᏂυ 1 year ago

    Converse of mod point theorm

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    • Posted by Deshu Kaur 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Akshaya Mathi 1 year ago

    8.5

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    • Posted by Arpit Prajapati 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Saksham Jain 1 year ago

    All are 75

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    • Posted by Yuvraj Arora 1 year ago

    CBSE > Class 09 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Md Faiz Ansari 1 year ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Sarthak Rai 1 year ago

    296

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    • Posted by Divyansh Singh Bisht 1 year ago

    CBSE > Class 09 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Khushboo Seth 1 year ago

    CBSE > Class 09 > Mathematics
    • 0 answers
    ANSWER

    • Posted by Gargi Makkar 1 year, 1 month ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Harshal Patil 1 year, 1 month 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 1 year, 1 month 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 1 year, 1 month ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Ritika Burnwal 1 year, 1 month 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 1 year, 1 month ago

    3

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