Question

A wire is bent to form a circle of radius 21 cm,and then again bent to form an equilateral triangle.find the area of the equilateral triangle.

Answer 1

circumference of the circle = 2πr = 2×22/7 × 21 = 132 cm
perimeter of equilateral triangle = 132 cm
side of equilateral triangle is = 44 cm
area of equilateral triangle  = √3/4 × a²
area = √3/4 × 44 ×44
are = 484√3