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Geometry & MeasuresDeep Dive

Method: Finding Perimeter

Part of Perimeter — GCSE Mathematics

This deep dive covers Method: Finding Perimeter within Perimeter for GCSE Mathematics. Revise Perimeter in Geometry & Measures for GCSE Mathematics with 10 exam-style questions and 2 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 3 of 4 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 3 of 4

Practice

10 questions

Recall

2 flashcards

Method: Finding Perimeter

1 Identify ALL the sides (label unknown ones)
2 Calculate any missing lengths from given info
3 Add ALL the sides together
4 Give units (cm, m, etc.)

Keep building this topic

Read this section alongside the surrounding pages in Perimeter. That gives you the full topic sequence instead of a single isolated revision point.

Key FactsWorked ExampleWalking the Edge

Practice Questions for Perimeter

What is the perimeter of a shape?

  • A. The space inside a shape
  • B. The total distance around the outside of a shape
  • C. Half the sum of all sides
  • D. The longest side of a shape
1 markfoundation

Two similar rectangles have lengths in the ratio 3:5. The perimeter of the smaller rectangle is 24 cm. Explain how to find the perimeter of the larger rectangle without knowing its individual dimensions.

2 markshigher

Quick Recall Flashcards

Perimeter
Total distance around a shape, add all sides
Perimeter vs Area
Perimeter = distance AROUND (1D - cm, m). Area = space INSIDE (2D - cm², m²).

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