1

Problem

Find the perimeter of the shape.

2

Step

The given shape is an isosceles triangle.

3

Step

The sides of an isosceles triangle is:

a = 13 cm, b = 2 cm

4

Formula

The perimeter of an isosceles triangle is P = 2a + b.

5

Clue

Substitute the values by using formula:

P = 2(13) + 2

6

Step

After multiplication we get:

P = 26 + 2

7

Step

After addition we get:

P = 28

8

Solution

Therefore, the perimeter of an isosceles triangle is P = 28 cm.

9

Sumup

Please summarize steps

Choices

10

Choice-A

This is incorrect because it does not match the calculated perimeter of the isosceles triangle

Wrong 24 cm

11

Choice-B

This is correct because it does match the calculated perimeter of the isosceles triangle

Correct 28 cm

12

Choice-C

This is incorrect because it does not match the calculated perimeter of the isosceles triangle

Wrong 22 cm

13

Choice-D

This is incorrect because it does not match the calculated perimeter of the isosceles triangle

Wrong 20 cm

14

Step

Option

B

15

Sumup

Please summarize choices