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CBSE Class 10 Answered

How to solve the following problem?
Asked by | 27 Feb, 2009, 08:22: PM
Expert Answer

Area of triangle = s(s-a)(s-b)(s-c)

where s = a+b+c/2 and a = 60 b=80 and c=100

Now area of the field which the horses cannot graze is given by,

Area of ABC - (Area of sector1 + Area of sector 2 + Area of sector 3)...................eqn1

Now ABC = 900 , since the sides form a pythagorain triplet.

AB = a = 60

BC = b = 80

AC = c= 100

Now we have to ACB and BAC

Let ACB = θ1 and BAC = θ2

So, tan θ= AB/BC = 6/8

θ= tan-1 (3/4)        find the value from the trigonimetric table.

Similarly by using trigonimetric ratio's compute θ

Compute area of Sector by using the formula Πr2θ/360o

Put the values of area of sectors in equation 1 to get the final answer.

 

Answered by | 15 May, 2009, 03:05: PM
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