Question

Find the area of a circle circumscribing an equilateral triangle of side 15cm.
$\pi = 3.14$
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Answer 1

Let the radius of the circle be  r , this circle also circumscribing the equilateral triangle of side a = 15 cm

so from the relation between radius and side of triangle we get( hint: find by drawing the diagram :) ) 

r=315 cm

Area of the circle =π(315)2

                            =3.14×3225

                            =235.5cm2