Perimeter of Irregular 3-Sided Shapes (Grade 3)

Printable Grade 3 worksheet: add the given side lengths to find each perimeter. 14 problems with a computed answer key.

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Math · Grade 3

Perimeter of Irregular Shapes (3 sides)

Add all the side lengths to find each perimeter.

1.
An irregular triangle has sides of 2 cm, 8 cm, 12 cm. What is its perimeter?
2.
An irregular triangle has sides of 10 cm, 11 cm, 7 cm. What is its perimeter?
3.
An irregular triangle has sides of 8 cm, 2 cm, 3 cm. What is its perimeter?
4.
An irregular triangle has sides of 18 cm, 20 cm, 3 cm. What is its perimeter?
5.
An irregular triangle has sides of 10 cm, 4 cm, 10 cm. What is its perimeter?
6.
An irregular triangle has sides of 4 cm, 17 cm, 4 cm. What is its perimeter?
7.
An irregular triangle has sides of 3 cm, 17 cm, 16 cm. What is its perimeter?
8.
An irregular triangle has sides of 14 cm, 18 cm, 9 cm. What is its perimeter?
9.
An irregular triangle has sides of 4 cm, 19 cm, 20 cm. What is its perimeter?
10.
An irregular triangle has sides of 12 cm, 16 cm, 19 cm. What is its perimeter?
11.
An irregular triangle has sides of 12 cm, 12 cm, 19 cm. What is its perimeter?
12.
An irregular triangle has sides of 4 cm, 15 cm, 16 cm. What is its perimeter?
13.
An irregular triangle has sides of 19 cm, 14 cm, 5 cm. What is its perimeter?
14.
An irregular triangle has sides of 12 cm, 5 cm, 4 cm. What is its perimeter?

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