∵∠1=∠2,∠3=∠4,
∴∠4=2∠1=2∠2=∠3
∴∠2+∠3=3∠2=126°
∴∠2=∠1=42°
∴∠DAC=54-42=12°.
如图,在△ABC中,∠1=∠2,∠3=∠4,∠BAC=54°,求∠DAC的度数.
如图,在△ABC中,∠1=∠2,∠3=∠4,∠BAC=54°,求∠DAC的度数.
数学人气:468 ℃时间:2019-08-21 21:02:05
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