In the diagram the radius of the outer circle is 2x cm and the radius of the inner circle is 6 cm. The area of the shaded region
is 160
1 answer:
let's find the area of the outer circle and the inside circle
the inside's circle area
A= π x 6²=36π
the outer's
A' = π x 4x²= 4πx²
A'-A=4πx²- 36π=160πcm² equivalent to x²- 9=40, so x²=49 implies x =sqrt(49)=7, x=7.
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Are we supposed to find the area? If so, It's 36 because 6 times 6 equals 36 :p Hope I helped.
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I got answer choice A for this one.
4/7=N/12 cross multiply
7N=4*12
7N=48
N=48/7
So your answer is 6 6/7 or 6.8571428
