1. If the heights of two sides and one side of two triangles are equal, then the diagonal (a) of the third side of these two triangles. Equality) A. Equality B. Inequality C. Complementarity D. Complementarity or equality

Two. In △ABC and △A'B'C, AB = A' b and AC = A' c, there are four ways to prove △ ABC △ A 'b 'c:

1、BC=B'C' 2、∠A=∠A' 3、∠B=∠B' 4、∠C=∠C '

a、 1234 B、234 C、 12 D、34

C, 1 2, because the congruence of a triangle can be equal to the angle between three sides or two sides. So it is12.