If the sides of an equilateral triangle are 3 inches find th

If the sides of an equilateral triangle are 3 inches, find the area of the triangle.

Solution

Angles of equilateral triangle = 60 deg

Area of triangle = (1/2)*a*bsinC

a = b = 3 inch

Area = (1/2)*3*3*sin60

= (9/2)(sqrt3/2)

= 9sqrt(3)/4

= 3.89 sq units