Question

The side of an equilateral triangle is $2.8\mathrm{cm}$. Calculate its perimeter.

Answer 1

An equilateral triangle has all its three sides equal in measure

The perimeter of a triangle $=\mathrm{sum}\mathrm{of}\mathrm{all}\mathrm{sides}$

$$\begin{gathered} =2.6+2.6+2.6 \\ =8.4\mathrm{cm} \end{gathered}$$

Hence, the perimeter of a given triangle is $8.4\mathrm{cm}$