Question

Find the diameter of a circle whose area is
16 times the area of the circle with diameter
7 cm.

​

Answer 1

Step-by-step explanation:

R of circle whose d is 7cm = 7/2 cm. 

Area of circle = 7×7×22÷7×2×2 = 77/2 cm^2. 

Area of 2nd circle = 77×16÷2 = 616 cm^2. 

pi R^2 = 616 cm^2

R^2 = 616 ×7÷22 = 28×7 = 196 

R = 14 cm

Circumference = 2 pi R = 2×14×22÷7 = 88cm

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