来自刘显全的问题
若△ABC的三个内角的度数之比为3:4:5,则相应外角的度数之比为_____.
若△ABC的三个内角的度数之比为3:4:5,则相应外角的度数之比为_____.
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2020-12-25 03:28
若△ABC的三个内角的度数之比为3:4:5,则相应外角的度数之比为_____.
若△ABC的三个内角的度数之比为3:4:5,则相应外角的度数之比为_____.
180/(3+4+5)=15
15*3=45度外角的度数180-45=135
15*4=60度外角的度数180-60=120
15*5=75度外角的度数180-75=105
135:120:105=9:8:7