Question P6 Circles and curved boundaries
A 36 cm by 28 cm rectangle has a semicircle attached externally to each of its two opposite 28 cm sides. Find the outside perimeter. Use π = .
Answer
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Find the space inside a circle shape or the distance around its boundary.
In this one. Trace only the outside boundary. The shared diameters are inside the shape, so they are not part of its perimeter.
'Area' asks for square centimetres from the radius. 'Circumference' or 'perimeter' on a curved edge asks for plain centimetres from the diameter instead.
Children give a circumference answer in square units, or find a circle's area without squaring the radius first, mixing up the two kinds of measurement.
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