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19 August, 14:11

A circle has an area of 324π cm2. What is the radius?

a.

18 cm

c.

18π cm

b.

36π cm

d.

36 cm

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Answers (1)
  1. 19 August, 14:22
    0
    area of a circle = PI*r^2

    324PI = PI*r^2

    divide both sides by PI

    324 = r^2

    r = sqrt (324)

    r = 18

    Answer is A 18 cm
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