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標題:
中二數學！！！！！
發問:
1.Find the value of n if the sum of interior angles of an n-sides polygon is 156°*n 2.if the exterior angles of a heptagon are 30°,40°,50°,60°,2x,1/3x+30°and 1/5x+36°,find x
最佳解答:
1. (n-2)*180/n = 156 180n - 360 = 156n 24n = 360 n = 15 2. 30 + 40 + 50 + 60 + 2x + x/3 + 30 + x/5 + 36 + ( 7 - 2 ) * 180 = 7 * 180 1146 + 38x/15 = 1260 38x/15 = 114 x/15 = 3 x = 45
其他解答:
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好好！|||||(1) (n-2)*180/n = 156 180n - 360 = 156n 24n = 360 n = 15 (2) 30 + 40 + 50 + 60 + 2x + x/3 + 30 + x/5 + 36 + ( 7 - 2 ) * 180 = 7 * 180 1146 + 38x/15 = 1260 38x/15 = 114 x/15 = 3 x = 45 Do you unstand ?
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