如图,若AB=AC,BG=BH,AK=KG,则∠BAC的度数为( ) A.30° B.32° C.36° D.40°
问题描述:
如图,若AB=AC,BG=BH,AK=KG,则∠BAC的度数为( )
A. 30°
B. 32°
C. 36°
D. 40°
答
∵AB=AC,BG=BH,AK=KG
∴∠ABC=∠ACB,∠G=∠H,∠A=∠G
∴∠ABC=2∠A,∠HKC=2∠A
∵∠H+∠HKC+∠HCK=180°,∠HCK=∠ACB
∴5∠A=180°
∴∠A=36°
故选C.