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Mathematics for IGCSE & O level - Geometrical Terms (Section 5 - No. 17)

What is the diameter of a circle if its radius is 5.7 cm?
2.85 cm
11.4 cm
17.1 cm
22.8 cm

解释

The diameter is twice the radius, so 2 * 5.7 = 11.4 cm.

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