Question P4 Rectangle and square measurement
A rectangle has perimeter 28 cm and length 8 cm. Find its width.
Answer
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Rectangle and square measurement
Use opposite equal sides, undo the area or perimeter formula, and count each outside edge once.
In this one. A rectangle has two lengths and two widths. Halving the perimeter exposes one of each.
Squares tiling a rectangle, or a shape made of several rectangles joined together, point here. The question asks for area, perimeter, or the length of a missing side.
Children multiply length by width when the question actually asks for perimeter. On a composite shape, they add only the labelled sides and miss the ones they must work out themselves.
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