1

Problem

In an acute triangle, the side lengths are 5 cm, 6 cm, and 7 cm. What is the perimeter of the triangle?

2

Formula

The perimeter of a triangle is P = a + b + c.

3

Step

The lengths of a triangle are

5 cm, 6 cm, 7 cm

4

Step

Substitute the values

P = 5 + 6 + 7

5

Step

Simplification

18

6

Solution

Then the perimeter of acute angle triangle is 18 cm.

7

Sumup

Please summarize steps

Choices

8

Choice-A

This is not correct because it does not represent the correct sum of the side lengths of the triangle

Wrong 24 cm

9

Choice-B

This is not correct because it does not represent the correct sum of the side lengths of the triangle

Wrong 22 cm

10

Choice-C

This is not correct because it does not represent the correct sum of the side lengths of the triangle

Wrong 20 cm

11

Choice-D

This is correct because the perimeter of the triangle is indeed 18 cm

Correct 18 cm

12

Answer

Option

D

13

Sumup

Please summarize choices