△ABC中,角C=90°,D为斜边AB的中点,DE垂直AB交BC于E,已知角EAC:角DAE=2:5,求角BAC的度数

问题描述:

△ABC中,角C=90°,D为斜边AB的中点,DE垂直AB交BC于E,已知角EAC:角DAE=2:5,求角BAC的度数
答案是52.5

△ ABC,angle = 90 ° C,D hypotenuse AB to the midpoint,DE vertical AB BC to pay E,known Kok EAC :Kok DAE = 2:5,for the degree angle BAC