Triangle ABO is isosceles. Angle AOB=360-(90+30+3*180/5)=132. So angle ABO=(180-132)/2=24. Angle ABC=24+30=54.
Triangle ABO is isosceles. Angle AOB=360-(90+30+3*180/5)=132. So angle ABO=(180-132)/2=24. Angle ABC=24+30=54.
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很好
-yma16-
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01/21/2024 postreply
16:15:16
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劳驾你再想想怎么求角BAC.
-yma16-
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01/21/2024 postreply
19:26:02
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解不了,好像必须靠复杂的计算,期待高手来解
-monseigneur-
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01/21/2024 postreply
21:11:47
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我做了。图是倒的。我不会把它变正。在我的电脑里是正的。
-yma16-
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01/22/2024 postreply
08:12:35
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谢谢分享,我也是这么想的,但因为计算复杂而放弃了
-monseigneur-
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01/22/2024 postreply
09:44:25
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