Question

Find the area of an equilateral triangles whose perimeter is equal to 18 cm. Also find its height

Answer 1

Answer:

Step-by-step explanation:

Perimeter=18 cm= 3a

So,

Side(a)=6 cm

Height^2 = 6^2 - 3^2

Thus,

Height= 5 cm

Therefore area= 1/2 *base *height

= 1/2*6*5

= 15 cm²

Hope it helps you