Find the radius and the circumference of a circle whose area is 121
pie cm
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Answer:
area of circle = πr²
Step-by-step explanation:
area = 121π
πr² = 121π
r²=121
r = +11 or - 11
radius cannot be negative so , r = 11
circumference = 2πr = 2 x 11 x 3.14
= 22 x 3.14 = 69.08 cm
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