Question

The side of an equilateral triangle is $3.5cm$. find its perimeter.

Answer 1

The perimeter of the triangle is the sum of all the sides of the triangle.

But, in an equilateral triangle, all sides are equal.

So, perimeter $=3.5+3.5+3.5$

$$\begin{gathered} =7.0+3.5 \\ =10.5 \end{gathered}$$

Hence, the Perimeter of an equilateral triangle is $10.5cm$