如图,已知△ABC的顶点均在坐标轴上,且点A(3,0),点B(0,5),AD

Question

如图,已知△ABC的顶点均在坐标轴上,且点A(3,0),点B(0,5),AD

Answer 1

1、BO=4CO BO=5 CO=5/4 C(-5/4,0)
面积是85/8
2、当点C在X的负半轴∠BED=∠AEO
∠AEO+1/2∠BAC=90° ∠BAC=180°-2∠BED
∠BAC=180°-∠ABC-∠ACB
∠ABC+∠ACB=2∠BED
3、若C在X正半轴运动当C在A点的左边时
∠ABC+∠ACB=360°-2∠BED
若C在X正半轴运动当C在A点的右边时
∠ABC+∠ACB=2∠BED