A circle has a radius of 7 cm. Calculate the area of the circle, giving your answer correct to 3 significant figures.

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Question

A circle has a radius of 7 cm. Calculate the area of the circle, giving your answer correct to 3 significant figures.

Accepted Answer

154 cm² — Area = πr² = π × 7² = π × 49 ≈ 153.938... cm² ≈ 154 cm² (3 s.f.). Option A (153 cm²) is rounded to 3 s.f. incorrectly, truncating rather than rounding. Option C (144 cm²) results from using r = 6 (a common off-by-one radius error). Option D (176 cm²) results from using the diameter squared instead of radius squared.

Answer

144 cm²

Answer

176 cm²

Answer

154 cm²

Answer

153 cm²

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