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 8 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and 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
Practice questions for Area of Rectangles & Triangles
Which formula gives the area of a rectangle with length l and width w?
Explain why the area formula for a triangle uses the perpendicular height rather than the slant height.