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Total area of circle = π r2 = 22/7 × 7 × 7 = 22 × 7 (since r = AB = 7).

Unshaded area is 3/4 of circle = 3/4 x 22 x 7 = 115.5 cm2.
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Sigh.  Remember to read the question carefully.  It asked for the unshaded region, rather than the shaded region which is normally the case.  Talk about being just being sneaky… 😆 

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I think this has been the case for many years. Sometime shaded, sometimes unshaded. If the question setter is nice, they will bold “unshaded” like in this question. Sometimes they don’t indicate.

No matter what, students have to be careful. Underline the important points, make sure the correct numbers are copied to and from the working, double check the answers if there is time, work fast and accurately to create that extra time for checking, etc. It is a matter of discipline developing into good habits. Not easy being a kid in primary school.

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