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Let AC be the building and ED be the tower. Draw the angles and join E to a point on AB, parallel to CD. To make the angle of 30° on top of tower. Now, BC=ED and CD=BE and AC=60 m(given). In triangle ACD tan 60°=AC/CD => root 3 = 60/CD => CD = 60/root 3 => CD= 20 root 3 metre Therefore, BE = 20 root 3 metre (since CD=BE) In triangle ABE tan 30°= AB/BE => 1/root 3 = AB/ 20 root 3 (since BE= 20 root 3 metre) => AB= 20 metre Therefore, BC= AC - AB BC = 60-20 Therefore, BC = 40m Therefore, height of tower is 40m.( since BC = ED)

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Chapter 4 ex 4.1 question 2(2)

Posted by Kenvi Chaklasiya 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Kashish Garg 4 years, 7 months ago

Let the two integer be x, x+1 X(x+1) =306 X square+x=306 X square+x-306=0 This is the required quadratic equation.

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P(x)=x4-5x+6, g(x)2-x2

Posted by Palak Sharma 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 7 months ago

Please ask question with complete information.

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Use Euclid division algorithm to find HCF of 196 and 38220

Posted by Moksha Sahu 4 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Varun Jakhar 4 years, 7 months ago

38220= 196*195+0 So , the HCF of ( 38220,196)= 195.

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Mahesh Pawar 4 years, 7 months ago

Ok I will you on whatsapp

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Find the median of the first 10 prime numbers

Posted by Lata Kumari 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Khushi 4 years, 7 months ago

12.

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KI EXERCISE 6.4 AUR 6.5 AAENGI KYA EXAM MEIN IS SAAL??

Posted by Mary Stuart 4 years, 7 months ago

CBSE > Class 10 > Mathematics

4 answers

Apache ?? 4 years, 7 months ago

Yes

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Mayank Choudhary 4 years, 7 months ago

Ha koi doubt h kya

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Sneha Bhardwaj 4 years, 7 months ago

Yes

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Hetan Kumar 4 years, 7 months ago

Yes

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KOI TOH BATADO YAAR PLEASE YAAR KL PRE BOARD HAI MERA???

Posted by Mary Stuart 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Mayank Choudhary 4 years, 7 months ago

Bhai mera bhi h ???

2Thank You

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proove that 5 + 2√5 is irrational

Posted by Ronit Vinod 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Account Deleted 4 years, 7 months ago

Let 5+2√5 be a rational number = p/q Where p and q are coprime numbers & q≠0 So 5+2√5 = p/q 2√5 = (p-5q)/q => √5 = (p-5q)/(2q) Since RHS is a rational number => √5 is a rational number But it contradicts the fact i.e.√5 is irrational number Therefore our assumption was incorrect => 5+2√5 is an irrational number Hence proved

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BATADO YAAR ???

Posted by Mary Stuart 4 years, 7 months ago

CBSE > Class 10 > Mathematics

4 answers

Apache ?? 4 years, 7 months ago

Yes

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Mayank Choudhary 4 years, 7 months ago

Kya

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Mary Stuart 4 years, 7 months ago

That Will EXERCISE 6.4 and 6.5 aaengi exam mein?

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Tsering Diskit 4 years, 7 months ago

Kya bataung ..

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find the real roots of the quadratic equation 3x2 – 5x – 2 = 0

Posted by Daud Sheikh 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 7 months ago

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chaper 2 Ex 2.10

Posted by Rohit Singh 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Sia ? 4 years, 7 months ago

https://mycbseguide.com/course/cbse-class-10-mathematics/1202/

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SORRY..... EXERCISE 6.5* AA RAHI HAI KYA IS SAAL??

Posted by Mary Stuart 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Mayank Choudhary 4 years, 7 months ago

Nhi h

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EXERCISE 6.6 AA RAHI HAI KYA ?? IS SAAL

Posted by Mary Stuart 4 years, 7 months ago

CBSE > Class 10 > Mathematics

4 answers

Mayank Choudhary 4 years, 7 months ago

CBSE board me to aa rahi h

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Mary Stuart 4 years, 7 months ago

Rajasthan

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Mary Stuart 4 years, 7 months ago

Kyu

1Thank You

Anshuman Yadav 4 years, 7 months ago

Tum kha se ho

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EXERCISE 6.4 AA RHI HAI KYA?? IS SAAL

Posted by Mary Stuart 4 years, 7 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

What is HCF of 8 and 6

Posted by Devesh More 4 years, 7 months ago

CBSE > Class 10 > Mathematics

5 answers

Purvi Jindal 4 years, 7 months ago

1Thank You

Anshuman Yadav 4 years, 7 months ago

HCF of 8 and 6 is 2

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Muthu Kumar 4 years, 7 months ago

1Thank You

Sulanda Shrivastav 4 years, 7 months ago

8}6 by encluid division lemon method a=pq +r 8= 6×1+ 2 = 8 6= 6×1+0= 6

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D S 4 years, 7 months ago

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2√45+3√20-10√125/2√5

Posted by Anshuman Yadav 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Adithya Dev A 4 years, 7 months ago

This can also be written as :- 2√9*5 + 3√4*5 - 10√25*5 / 2√5 = 2*3√5 + 3*2√5 - 10*5√5 / 2√5 = 6√5 + 6√5 - 50√5 / 2√5 = (6 + 6 -50)√5 / 2√5 = -38√5 / 2√5 = -19//.

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Show that every positive integer is of the form 9q,and that every positive odd integer is of the form 9q,9q+1,9q+8,where q is some integer

Posted by Chhotu Kumar 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Abhishek Agrawal 4 years, 7 months ago

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Prove that 2-√3/2 is irrational number.

Posted by Tanisha Shekhawat 4 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Chhotu Kumar 4 years, 7 months ago

Show that every positive integer is of the form 9q,and that every positive odd integer is of the form 9q,9q+1,9q+8,where q is some integer

2Thank You

Ashwani Singh 4 years, 7 months ago

This contradicts the fact that root3 is irrational number.. Since contradiction has arisen in our assumption. Therefore we conclude that given number is also a irrational number

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What is area of cube

Posted by Blue Moon Boy 4 years, 7 months ago

CBSE > Class 10 > Mathematics

3 answers

Ankit Kumar 4 years, 7 months ago

6a^2

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Mayank Choudhary 4 years, 7 months ago

(a)^3

1Thank You

Aditya Kumar 4 years, 7 months ago

6 × side^2

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The difference between two natural no is 2 and the difference of there reciprocal is 1upon 24 find the number

Posted by Tinku Tinku 4 years, 7 months ago

CBSE > Class 10 > Mathematics

1 answers

Pawan Kumari 4 years, 7 months ago

Let two no. be x and y . x - y = 2 ----- (1) 1/y - 1/x = 1/24 x - y/xy = 1/24 x - y = xy/24 From 1 ; 2 = xy/24 xy = 48 x= 48/y Put x = 48/y in equation 1 48/y - y =2 y^2 + 2y - 48 = 0 (y+ 8)(y - 6)= 0 y = -8 or 6 Hence , x = 8 and y = 6 .

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If α and β are the zeros of the Polynomial f(x)=x2-5x+k such that α-β=1 find the value of K?

Posted by Ashok Kumar 4 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Aditya Kumar 4 years, 7 months ago

a-b=1 and a+b=5 By solving it We will get a=3 and b = 2 So ,k = ab = 3×2 = 6 Hence, k=6

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Blue Moon Boy 4 years, 7 months ago

a=1, b=-5, c=k We r doing this formula D =b2 - 4ac (-5)2 -4*1*k 25 - 4k = 0 -4k = -25 subtract sin se subtract sin cancel we get 4k =25 K = 25/4

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Find the roots of the quadratic equation 3x² - 2√6x + 2 = 0

Posted by Apache ?? 4 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Apache ?? 4 years, 7 months ago

Thanks

1Thank You

Aditya Kumar 4 years, 7 months ago

3x2 - 2√6x +2 =0 =) (√3x)^2 - 2×√3x ×√2 + (√2)^2 = 0 =) (√3x - √2)^2 =0 So √3x -√2 =0=) x = √2/√3

1Thank You

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Find the roots of the equation 2x² - 5x + 3 = 0, by factorisation.

Posted by Apache ?? 4 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Blue Moon Boy 4 years, 7 months ago

Middle term splitting

1Thank You

Ashok Kumar 4 years, 7 months ago

2 x square- 3x - 2x plus 3

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Solve the following pair of linear equations : (I) 152x - 378y = -74 and -378x +152y = -604

Posted by Apache ?? 4 years, 7 months ago

CBSE > Class 10 > Mathematics

2 answers

Apache ?? 4 years, 7 months ago

Thank u

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Adithya Dev A 4 years, 7 months ago

Let first equation be (1) and second equation be (2). Now, do (1) - (2) to get (A). Then, do (1) + (2) to get (B). Solve equations (A) and (B) to get required answer. Hope it helps you. Thank you for sharing the question. ?

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26 by 6 in decimals expission

Posted by Nithin Krishna Rm Nithin Krishna Rm 4 years, 7 months ago

CBSE > Class 10 > Mathematics