Question

The side length of an equilateral triangle is 5 cm.

Find its perimeter

Answer 1

Answer: 15 cm

Step-by-Step Explanation:

Side Length (a) = 5cm
Perimeter = 3a

Therefore,
= 3a
= 3 * 5
= 15

Perimeter = 15 cm

Answer 2

$\rule{300}{1}\\\dashrightarrow\large\blue\textsf{\textbf{\underline{Given question:-}}}$

                The side length of an equilateral triangle is 5 cm. Find its perimeter.

$\dashrightarrow\large\textsf{\textbf{\underline{Answer and how to solve:-}}}$

We are given that the triangle is equilateral.

"equi" means "equal" and "lateral" means "sides"

✯ So an equilateral triangle has 3 equal sides.

We are also given that one side is equal to 5 cm.

If one side is equal to  5 cm, and the triangle's equilateral, then the other two sides are equal to 5 cm.

◈ In order to find the perimeter of a shape, you should add all of its side lengths together.

✯ Now, we need to find the perimeter, which we can find using the following formula:-

$\bold{Perimeter_{(triangle)}=a+b+c}$

• Where a, b, and c are side lengths of the triangle.

Now, we add them:-

$\hookrightarrow\sf{P=5+5+5}$

So we conclude that the perimeter is equal to:-

$\hookrightarrow\sf{P=15\:cm}$

Good luck with your studies.

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