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Mathematics for IGCSE & O level - Mensuration (Section 12 - No. 10)

If the area of a circle is 28.26 cm², and pi = 3.14, what is its radius?
3cm
6cm
9cm
4.5cm

Giải thích

A = πr², Therefore, r² = A/π, r = √(28.26/3.14), r=3cm.

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