Answer :

Area of equilateral triangle = ,

Where, x is the equal side of triangle

Area of square = side × side

Let side of square here be x cm

In a square the diagonal is hypotenuse

Diagonal = hypotenuse = √ 2 a

According to the given condition

60 = √ 2a

a = 30√2

Area of square = (30√2 )2 = 3600 ………….eq1


From eq 1

Area of equilateral triangle = 1800√ 3cm

But Area of equilateral triangle =

1800√ 3 =

84.85 = x cm

Perimeter of the equilateral triangle = 3x

= 3 × 84.85

= 254.56 cm

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