alleryA coin has a radius of 7 mm. How wide is it across its centre?
A14 mm
B3.5 mm
C49 mm
D21 mm
Answer & Solution
Correct answer: A. 14 mm
1. The diameter is twice the radius.
2. 2 x 7 cm = 14 cm.
3. 3.5 cm would be half the radius, which is the wrong direction.
_Source: Wikipedia, Circle, Terminology_
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