Triangle Square

Triangle square:

Find the area and perimeter of triangle whose side 12 cm.

Sol:

All sides of equilateral triangle area equal.

Side of triangle, a = 12 cm

Area of the triangle (A) = a² x

= 12² x (1.732/4)

= 144 x 0.433

= 62.352 cm²

Perimeter of equilateral triangle (P) = 3a

= 3 x 12

= 36cm

To know more:

Volume calculations

sphere area