# A point O is take

Let each side of be a cm

So, area ( ) = Area ( ) + Area ( ) + Area ( ) On taking “a” as common, we get,   = 15a cm2 (i)

As, triangle ABC is an equilateral triangle and we know that:

Area of equilateral triangle = cm2 (ii)

Now, from (i) and (ii) we get:

15a = 15 × 4 = 60 = a = a = 20√3 cm

Now, putting the value of a in (i), we get

Area ( ) = 15 × 20√3

= 300√3 cm2

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