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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勞駕你再想想怎麽求角BAC.
-yma16-
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01/21/2024 postreply
19:26:02
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解不了,好像必須靠複雜的計算,期待高手來解
-monseigneur-
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01/21/2024 postreply
21:11:47
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我做了。圖是倒的。我不會把它變正。在我的電腦裏是正的。
-yma16-
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01/22/2024 postreply
08:12:35
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謝謝分享,我也是這麽想的,但因為計算複雜而放棄了
-monseigneur-
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01/22/2024 postreply
09:44:25
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