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OpenStudy (anonymous):
a) Joey used 10 congruent triangles to create a regular decagon. What kind of triangles is he using? b)Joey used 10 congruent triangles to create a regular decagon. Find the three angle measures of one of the triangles. Explain how you know. c)Joey used 10 congruent triangles to create a regular decagon. If the area of each triangle is 14.5 square inches, then what is the area of the regular decagon? Show all work.
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