# Perimeter: How Big is the Polygon?

In this worksheet, students work out the perimeter of a regular 2D polygon.

Key stage:  KS 2

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   2D Shapes: Triangles, Quadrilaterals and Polygons

Difficulty level:

### QUESTION 1 of 10

In this worksheet, children must work out the perimeter of a regular 2D polygon.

Perimeter is the total distance around the outside of a 2D shape. You can calculate it by adding together the length of all the sides.

Remember that in a regular polygon, all the sides are the same length.

Example

Calculate the perimeter of the shape.

 3 cm

First count the number of sides.

There are 5 sides in this shape (pentagon).

It is regular so each side is 3 cm long.

The perimeter is 5 x 3 = 15 cm

Remember the answer is 15 cm not just 15

Calculate the perimeter of the shape.

 10 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 5 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 6 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 10 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 10 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 8 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 6 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 5 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 9 cm

Remember to write your answer in cm.

Calculate the perimeter of the shape.

 7 cm

Remember to write your answer in cm.

• Question 1

Calculate the perimeter of the shape.

 10 cm

Remember to write your answer in cm.
70cm
70 cm
• Question 2

Calculate the perimeter of the shape.

 5 cm

Remember to write your answer in cm.

25 cm
25cm
• Question 3

Calculate the perimeter of the shape.

 6 cm

Remember to write your answer in cm.

48cm
48 cm
• Question 4

Calculate the perimeter of the shape.

 10 cm

Remember to write your answer in cm.

80 cm
80cm
• Question 5

Calculate the perimeter of the shape.

 10 cm

Remember to write your answer in cm.

100cm
100 cm
• Question 6

Calculate the perimeter of the shape.

 8 cm

Remember to write your answer in cm.

72 cm
72cm
• Question 7

Calculate the perimeter of the shape.

 6 cm

Remember to write your answer in cm.

48 cm
48cm
• Question 8

Calculate the perimeter of the shape.

 5 cm

Remember to write your answer in cm.

40cm
40 cm
• Question 9

Calculate the perimeter of the shape.

 9 cm

Remember to write your answer in cm.

81cm
81 cm
• Question 10

Calculate the perimeter of the shape.

 7 cm

Remember to write your answer in cm.

49cm
49 cm
---- OR ----

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