问题描述:
图这是几何题目,要写因为所以
问题解答:
180-(90-45-(90-80))-(180-20-(90-(90-80)))=65∠CAB=(90-45)-(90-80)=35∠ABC=180-20-(90-(90-80))=80∠ACB=180-∠CAB-∠ABC=180-35-80=65
180-(80-45)-(180-80-20)=55∠CAB=80-45∠ABC=180-80-20∠ACB=180-∠CAB-∠ABC
45+20=65
55