# math

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the inner circumference of a ring is 1.2pi cm. the outer circumference of the ring is 2pi cm. find the area of the region bounded by the outer and inner circumference.

• math -

The two radii are 0.6 and 1 cm.

The area of the bounded region is thus
pi[1^2 - 0.6^2] = 0.64*pi cm^2

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