Explanation Formula used: Area of a ring(Annulus) Shaded area = area of outer circle − area of inner circle A = π R 2 − π r 2 Calculation: Area of the shaded region is the difference of the area between the outer circle and the inner circle. The diameter of the outer circle is 9 inches and the inner circle is 4 inches. This implies that the radius of the outer circle is 4.5 inches and the inner circle is 2 inches. Use the above formula and find the shaded area as follows. A = π ( 4.5 ) 2 − π ( 2 ) 2 = π ( 20.25 − 4 ) = π ( 16

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Chapter 8, Problem 17BPS

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The area of the shaded region and the circumference of the outer circle.

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Chapter 8 Solutions

EP MATHEMATICS FOR THE TRADES

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The area of the shaded region and the circumference of the outer circle.

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The area of the shaded region and the circumference of the outer circle.

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