Question

如果,已知点D在BC上,AB=AC=BD,AD=DC

Answer 1

(1)图中有3个等腰三角形：△ABC,△ABD,△ADC.

(2)∠BAD=∠BDA=∠DAC+∠C=2∠C,

∴∠BAC=3∠C,

∴∠BAC+∠B+∠C=5∠C=180°,

∴∠C=36°.