Find the circumference of a circular disk whose area is 400π cm².
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A = π R² , where R is the radius of the disk
Area A = 400π
π R² = 400π
R² = 400
R = 20 cm
CIRCUMFERENCE
= 2 π R
= 40 π cm
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Answer:
Area of a circle = pi.r^2 , where r is the radius of circle.
pi.r^2 = 100.pi
r^2 = 100 => r = 10 units.
Circumfrance of circle = 2.pi.r
= 2.pi.10 = 20.pi units , Answer
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