在三角形ABC中,設AB=4r, cosA = 8/2r, 用餘弦定理。
12^2 = 8^2 + 16r^2 - 64r(8/2r)
r^2 = 21
陰影麵積= 10.5 Pi.
在三角形ABC中,設AB=4r, cosA = 8/2r, 用餘弦定理。
12^2 = 8^2 + 16r^2 - 64r(8/2r)
r^2 = 21
陰影麵積= 10.5 Pi.
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我想到的三種方法都是幾何解法
-萬斤油-
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02/01/2022 postreply
22:26:28
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大家齊努力,找出幾何解法。沒準還有更多的解法。
-wxcfan123-
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02/01/2022 postreply
23:47:53
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