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Perimeter (F)

Test your knowledge of perimeter in this quiz.

Perimeter (F)

Build perimeter skills for GCSE Foundation. Add side lengths, handle rectangles, triangles and compound shapes, and keep units consistent so your answers match real-world fencing and edging problems.

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Fascinating Fact:

In garden fencing, a 4 m by 3 m rectangle has perimeter = 2(4 + 3) = 14 m, so you need at least 14 m of fence.

In GCSE Maths, perimeter means the total distance around a 2D shape. You’ll add side lengths for rectangles and triangles, and trace outer edges only for compound shapes, always stating correct units.

Key Terms

Perimeter: The total length around a shape’s boundary (e.g., rectangle P = 2(l + w)).
Compound shape: A shape made from simpler shapes; add just the outside edges.
Units: Labels showing what you measured in, such as mm, cm, or m. Keep them consistent.

Frequently Asked Questions (Click to see answers)

How do I find the perimeter of a rectangle?

Use P = 2(l + w). For example, a 4 m by 3 m rectangle has P = 2(4 + 3) = 14 m.

What is the perimeter of a compound shape?

Trace the outside only and add those lengths. Do not include internal lines; match any missing sides using parallel or shared edges.

Do I need to convert units before adding lengths?

Yes. Convert to the same unit first (e.g., 150 cm = 1.5 m). Add the lengths, then give the final answer with units.

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You can find more about this topic by visiting BBC Bitesize - 2-dimensional shapes

Author: Sally Thompson (MSc Operational Research, Secondary Maths Teacher & Quiz Writer)

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