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Question

The figure below is a regular octagon. What fraction of its area is shaded?


A

1/3

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B

1/4

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C

1/5

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D

3/8

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Solution

The correct option is B

1/4


The diagram shows how the octagon can be divided into 4 congruent rectangles and 8 congruent triangles. Let R represent the area of a rectangle and let T represent the area of a triangle. Then the ratio of the shaded region to the area of the entire octagon is R+2T4R+8T=14


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