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Geometry & MeasuresStudy Notes

Worked Example 3: Finding a Missing Length

Part of Area of Rectangles & Triangles — GCSE Mathematics

This study notes covers Worked Example 3: Finding a Missing Length within Area of Rectangles & Triangles for GCSE Mathematics. Revise Area of Rectangles & Triangles in Geometry & Measures for GCSE Mathematics with 12 exam-style questions and 6 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 6 of 7 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 6 of 7

Practice

12 questions

Recall

6 flashcards

Worked Example 3: Finding a Missing Length

A rectangle has area 48 cm² and width 6 cm. Find the length.

Step 1 Write what we know

Area = length × width

48 = length × 6

Step 2 Rearrange to find length

length = 48 ÷ 6 = 8 cm

Keep building this topic

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

Worked Example 2: TriangleCommon MistakesWhat is Area?The Key Formulas

Practice Questions for Area of Rectangles & Triangles

Which formula gives the area of a rectangle with length l and width w?

  • A. 2(l + w)
  • B. l + w
  • C. l × w
  • D. (1/2) × l × w
1 markfoundation

Explain why the area formula for a triangle uses the perpendicular height rather than the slant height.

2 markshigher

Quick Recall Flashcards

Rectangle Area
Area = length × width (A = l × w)
Triangle Area
Area = ½ × base × perpendicular height (A = ½bh)

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Worked Example 2: Triangle

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Common Mistakes