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2008-01-17 10:23 pm
in the regular a-sides polygon,the size of interior angle is nine times that of an exterior angle.find the value of a.
回答 (2)
2008-01-18 9:01 am
✔ 最佳答案
Let the size of each exterior angle be x, the size of each interior angle be 9xx + 9x = 180° ( adj. ∠s on st.line )
10x = 180°
x = 18°
The size of each exterior angle is 18°
Let the no of sides of this polygon be y
y( 18° ) = 360° ( sum of ext. ∠ of polygon )
y = 20
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