Mensurationhard · Past Paper
If the area of a circle is doubled, its radius increases by a factor of:
A2
Bsqrt(2)
C4
D1.44
✓ Correct Answer: B — sqrt(2)
A2 = 2*A1 => pi*r2^2 = 2*pi*r1^2 => r2 = sqrt(2)*r1.
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