MathsFreePrintable

Seashore Perimeter Measurement

A free maths worksheet ready for your classroom. Open in Kuraplan to grab the print-ready PDF, customize it for your students, or generate a fresh version in seconds.

Download now

Name:Date:

Seashore Perimeter Measurement

Losa, Keira and Manaia are planning safe activities at the seashore. Help them measure boundaries and borders. Perimeter is the total distance around the outside of a shape. Add every outside side, using the same units.

Warm up: perimeter

Choose, complete and explain.

1.Which statement describes perimeter?

The space covered inside a shape
The distance around the outside of a shape
The longest side of a shape
The height of a shape

2.Fill both gaps: To find perimeter, I all the outside side lengths. I should write the answer in a unit such as .

3.The club needs a tool to measure around a large activity area on the sand. Name one suitable tool and explain why it works.

Measure the boundaries

Work out each perimeter. Show how you added the sides.

4.A rectangular flag area is 8 m long and 5 m wide. What is its perimeter?

5.A triangular sand marker has sides of 6 cm, 4 cm and 7 cm. Find its perimeter.

6.A square sign beside the club has sides of 3 m. How much reflective tape is needed to go once around its edge?

7.Manaia measures a rectangular display board as 15 cm by 12 cm. How much trim is needed around the whole edge?

8.True or false? If every side length of a square is doubled, its perimeter is doubled too. Explain using a square with side 4 cm.

Seashore measuring puzzle

Use the side lengths in the table to help plan a safe rope boundary.

Plan

Side lengths

Perimeter

6 m, 6 m, 4 m, 4 m

5 m, 5 m, 5 m, 5 m

9.Calculate the perimeters of Plan A and Plan B. Which plan needs more rope, and how many metres more?

10.Keira has 24 m of rope. Could she use it to mark Plan A's whole boundary? How much rope would be left?

Design a shell display

Create a shape and show how you would measure around it.

11.Draw a seashore-shaped display border with at least four straight sides. Label each side with a length in centimetres, then calculate its perimeter. Your answer should include the side lengths and the total.