the magnitude of the area of a circle is 20 times that of its circumference. what is the circumference (in units) of the circle?
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circumference of circle = 2πr
area of circle = πr²
area = 20 x circumference
πr²= 20x2πr=40πr
r = 40
therefore circumference is 2πr = 2x3.14x40=251.2 units
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