如图,在△ABC中,AB=AC,∠A=36°,AB的垂直平分线交AC于点E,垂足为点D,连接BE,则∠EBC的度数为(  ) A.18° B.36° C.60° D.72°

问题描述:

如图,在△ABC中,AB=AC,∠A=36°,AB的垂直平分线交AC于点E,垂足为点D,连接BE,则∠EBC的度数为(  )
A. 18°
B. 36°
C. 60°
D. 72°

∵AB=AC,∠A=36°,
∴∠C=∠ABC=

1
2
(180°-∠A)=72°,
∵DE是AB的垂直平分线,
∴AE=BE,
∴∠ABE=∠A=36°,
∴∠EBC=∠ABC-∠ABE=72°-36°=36°,
故选B.