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Polygon Perimeter Practice

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Polygon Perimeter Practice

Mei, Nikau and Hugo are checking the lengths around shapes on a ferry. Perimeter means the distance all the way around a shape. Add the lengths of every side. Use centimetres (cm) for each answer.

Spot the polygons

1.Which of these shapes are polygons? Select every correct answer.

Triangle
Circle
Square
Rectangle

2.Hugo walks one complete lap around a square deck mat. What distance is he measuring?

The area inside the mat
The perimeter of the mat
The number of corners

Add around the edges

For each shape, add the length of every side.

3.Mei measures a triangular sign. Its sides are 3 cm, 4 cm and 5 cm. What is its perimeter?

4.Nikau finds a square tile with each side 4 cm long. Add the four equal sides to find its perimeter.

5.A rectangular window on the ferry is 6 cm long and 3 cm wide. The opposite sides match. What is the perimeter?

6.A four-sided ferry pass has side lengths 2 cm, 5 cm, 3 cm and 4 cm. What is its perimeter?

7.Mei says, “To find perimeter, I add all the side lengths.” Is Mei correct? Explain briefly.

Use what you know

8.Hugo has measured three sides of a triangular flag: 3 cm, 4 cm and 5 cm. Which tool would be useful for measuring a side, and what unit could he use?

9.Nikau says a shape has a perimeter of 10 cm. Draw or describe one polygon whose side lengths add to 10 cm. Label the sides if you draw it.

10.The ferry crew puts a ribbon around a rectangular notice that is 5 cm long and 2 cm wide. How many centimetres of ribbon do they need to go all the way around? Show your addition.