Question

The perimeter of an equilateral triangles 66cm find its area and height

Answer 1

Let the side be a

then,

perimeter=a+a+a

66cm=3a

a=66cm/3

a=22cm

Area of equilateral triangle=(√3/4)×a²

Area=(√3/4)×22×22

Area=11×11×√3

Area=121√3 cm²

Also,

area=(1/2)×base×height

121√3=(1/2)×22×height

121√3=11×height

height=11√3 cm

Answer 2

Answer:

Perimeter = 66 cm

Regular equilateral triangle = 3 sides

P of Regular equilateral triangle = 66÷3

66/3 = sides

22 cm = sides