The area enclosed between two concentric circles is 770cm square.If the radii of the circles differ by 7cm,find both the radii
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Find Radii of the circle.
Step-by-step explanation:
Let, the radius of the first circle be r1
Then, r1 = r
Let, the radius of the other circle be r2
Then, r2 = r+7
Area of circle =
According to the question,
Given,
Then,
Put the value of r1 and r2,
r = 14
So, r1 = 14 and r2 = r + 7 = 21
Therefore, the radius of 1st circle = 14 and 2nd circle = 21.
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