f.2 maths 1題20分
回答 (1)
2008-03-15 11:52 pm
✔ 最佳答案
The size of each interior angle of a regular 45-gon = 180°(45-2) / 45 = 172°By using the formula: 180°(n-2)/n, where n is the number of sides of a regular polygon.
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