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Into how many triangles can a simple decagon be divided to find its angle sum?

A6
B7
C8
D10
Answer & Solution
Correct answer: C. 8
1. A simple n-gon splits into (n - 2) triangles. 2. A decagon has 10 sides, so 10 - 2 = 8 triangles. 3. Using 10 triangles would count each side separately and gives a total that is too large. _Source: Wikipedia, Polygon, section Angles_
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