If for ∆ABC and ∆DEF, the correspondence CAB ↔ EDF gives a congruence, then which of the following is not true?

In Δ ABC, ∠A = 100°, AD bisects ∠A and AD ⊥ BC. Then, ∠B is equal to

In ∆ABC, ∠A = 50°, ∠B = 70° and bisector of ∠C meets AB in D (Fig. 6.17). Measure of ∠ADC is.

In Fig. 6.18, M is the mid-point of both AC and BD. Then

If D is the mid-point of the side BC in Δ ABC where AB = AC, then ∠ADC is