Question

A small circular mirror has a circular frame around it the diameter of the mirror is 14 cm the mirror is fitted with a frame along is circumference the diameter of the mirror including the frame is 21 cm what is the area of the frame

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Answer 1

Explanation:

Formula for area of a circle : pi r^2 r = 1/2 diameter

Area of (frame + mirror) - area of mirror = area of frame

pi ( 21/2)^2 - pi ( 14/2)^2 = area of frame = 192.4 cm^2