CBSE > Class 12 > Mathematics | CBSE Board | Homework Help

Let the radius of circle be r and length of one side of square be a. Circumference of circle =2πr Circumference of square=4a According to question, 2πr+4a=28 ...(2) 4a^2=(28-2πr)^2/4 .... (1) For minimum area, dy/dr>0 πr^2 + 4a^2=dy/dr Putting the value of equation (1) πr^2 + (28-2πr)^2/4=dy/dr 2πr - 2.(28-2πr).2π/4=dy/dr 2πr-28π+2rπ^2 =dy/dr For area dy/dr=0 r-14+πr=0 r=14/(π+1) Since dy/dr>0, so it will give minimum area Putting the value of r in equation (2) We get a=7/(π+1) Length of wire used in making circle=28π/(π+1) Length of wire used in making square=28/(π+1) I hope this will help you Agar solution me dikkat ho to whatsapp pe contact kar lena

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the ratio of the areas of two simiar triangles is equal to the square of the ratio ofe their corresponding sides

Posted by Surya Mageshwari 6 years ago

CBSE > Class 12 > Mathematics

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Evaluate as limit of sum of integration 0to 2 ( 3x^2_1) dx

Posted by Sana Khan 6 years ago

CBSE > Class 12 > Mathematics

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. Using the properties of determinants, prove that | ? + ? ? + ? ? + ? ? + ? ? + ? ? + ? ? + ? ? + ? ? + ? | = 2 | ? ? ? ? ? ? ? ? ? |

Posted by Srinivasan Alagar 6 years ago

CBSE > Class 12 > Mathematics

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Ncert exercise 7.4 question 4

Posted by Shalini Singh 6 years ago

CBSE > Class 12 > Mathematics

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Aditya Chauhan 6 years ago

Install spplication 12th maths Ncert soln Because ot is too much time consuming to write these soln here by keboard....

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A particle moves along the curve 6y=x^3+2. Find the points on the curve at which the y cordinate is changing 8times as farmt as x cordinate

Posted by Nishant Deshwal 6 years ago

CBSE > Class 12 > Mathematics

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Ritika Kumar 6 years ago

Bhai apna whatsapp number do Mai ussi pe solution de dunga

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Nishant Deshwal 6 years ago

Sry not farmt it is fast

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What is the topic from which the questions in probalbilityask in Cbse Class 12th board exam?

Posted by Vansh Makhija 6 years ago

CBSE > Class 12 > Mathematics

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Nishant Deshwal 6 years ago

Bayes theorem

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Find the vector equation of the plane passing through the intersection of planes r. i+j+k=6 and r.2i+3j+4k=-5 and points (1,1,1)

Posted by Lr Official 6 years ago

CBSE > Class 12 > Mathematics

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sin(π/4-x)=?

Posted by Abdus Samad 6 years ago

CBSE > Class 12 > Mathematics

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X^m×y^n=(x+y)^m+n find dy÷dx

Posted by Abhishek Singla 6 years ago

CBSE > Class 12 > Mathematics

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Tapan Pandey ?? 6 years ago

Go through NCERT solutions

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If [a+b 2] [5 ab]

Posted by Roshan Verma 6 years ago

CBSE > Class 12 > Mathematics

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What is rolles theorm

Posted by Komal Sidhu 6 years ago

CBSE > Class 12 > Mathematics

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Aditya Chauhan 6 years ago

Rolle's theorem states that if a function f is continuous on the closed interval [a, b] and differentiable on the open interval (a, b) such that f(a) = f(b), then f′(x) = 0 for some x with a ≤ x ≤ b.

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Integrate sinx/sin3x

Posted by Nikhil Chaudhary 6 years ago

CBSE > Class 12 > Mathematics

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Class 12 maths chapter wise therom

Posted by King Ajeet 6 years ago

CBSE > Class 12 > Mathematics

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Tamanna Sharma 6 years ago

Given in examidea

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domain of continuity of function arcsinx -[x]

Posted by Aditya Singh 6 years ago

CBSE > Class 12 > Mathematics

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Prove that function f(x):R--->{x€R:-1<x<1},f(x)=x/1+|x| is one one function

Posted by Darshan Nagle 6 years ago

CBSE > Class 12 > Mathematics

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Find direction cosine of line ,makes equal angles with coordinate axes

Posted by Shanu Gupta 6 years ago

CBSE > Class 12 > Mathematics

2 answers

Santosh Kumar 6 years ago

Let the direction cosine of the line which make an angle à with each of the coordinates axes and direction cosines be l,m,n. l=cosà, m= cosà and n=cosà l^2+m^2+n^2=1 Cos^2à+cos^2à+cos^2à=1 3 cos^2à=1 Cos^2à=1/3 Cosà=+_1/root3

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Tamanna Sharma 6 years ago

(1/root3 ,1/root3 ,1/root3)

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