1

Problem

If the side length of an equilateral triangle is 6 cm, what is its perimeter

2

Formula

The perimeter of an equilateral triangle is P = 3a.

3

Hint

All sides of an equilateral triangle are equal.

4

Step

The side of a equilateral triangle is

6 cm

5

Step

Substitute the values

P = 3 x 6

6

Step

After multiplication,

P = 18

7

Solution

Then the perimeter of a equilateral triangle is 18 cm.

8

Sumup

Please summarize steps

Choices

9

Choice-A

This is correct because it match the correct calculation for the perimeter of an equilateral triangle

Correct 18 cm

10

Choice-B

This is not correct because it doesn’t match the correct calculation for the perimeter of an equilateral triangle

Wrong 20 cm

11

Choice-C

This is not correct because it doesn’t match the correct calculation for the perimeter of an equilateral triangle

Wrong 22 cm

12

Choice-D

This is not correct because it doesn’t match the correct calculation for the perimeter of an equilateral triangle

Wrong 24 cm

13

Answer

Option

A

14

Sumup

Please summarize choices