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Alexeev081 [22]

2 years ago

10

The area of circle b is 36 times greater than the area of circle

1 answer:

Elena-2011 [213]2 years ago

8 0

The formula for area of a circle is pi r^2.
Circle A= pi a^2
Circle B= pi b^2

Now if the area of circle B is 36 times greater than the area of circle A, we can translate than into:
areaB=36*areaA
pi b^2 = 36 pi a^2
pi b^2 = 36 pi 12^2 (sub in variables)
b^2 = 36*12^2 (divide pi from both sides)
b^2 = 36 * 144 (solve 12^2)
b^2 = 5184 (simplify right hand side)
b = 72 (take square root on both sides)
Your answer is 72.

Have a nice day :D

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