△ABC中,∠A-∠B=20度;,∠A=2∠C,则∠A=_____,∠C=________

问题描述:

△ABC中,∠A-∠B=20度;,∠A=2∠C,则∠A=_____,∠C=________

△ABC中,∠A-∠B=20度;,∠A=2∠C,则∠A=__80___,∠C=___40_____过程?∠B=∠A-20=2∠C-20

∠C+(2∠C-20)+2∠C=5∠C-20=180
∠C=40

∠A=2∠C=80