D, E, F are the mid-point of the sides BC, CA and AB respectively of Δ ABC. Then Δ DEF is congruent to triangle

In a Δ ABC, if AB = AC and BC is produced to D such that ∠ACD =100°, then ∠A =

In an isosceles triangle, if the vertex angle is twice the sum of the base angles, then the measure of vertex angle of the triangle is

Which of the following is not criterion for congruence of triangles?

In Fig. 10.135, the measure of ∠B’AC’ is