Q.

The circumference of a circle Circumscribing an equilateral triangle is 24π units. The areas of the circle inscribed in the equilateral triangle is 4 aπ. Find.


Class:   9


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a

a = 9

b

a = 10

c

a = 8

d

a = 7 

answer is A.

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Detailed Solution

 Given. 2 πR = 24π
R = 12 units
 (r is the radios of in circle)
r = 6
Area of in circle = πr2 = 36 π
 On comparing 4πa = 36π
a = 9
  
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