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Mathematics 9 Online
OpenStudy (anonymous):

Find the area of a regular pentagon with a side length of 14 and an apothem of 22.

OpenStudy (tkhunny):

360/5 = 72 72/2 = 36 180 - 72 = 108 108/2 = 54 14/2 = 7 |dw:1400215659012:dw| Just draw it and do the arithmetic. How many triangles like that are there in a Regular Pentagon?

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