Question

Help please and thanks

Answer 1

D. m∠ADC = 180° - m∠ABC

Explanation:

Since AD⊥AB and CD⊥CB

In ABCD, ∠A=90°, ∠C=90°

So ∠B + ∠D = 180° as sum of 4 angles is 360°

Therefore the correct answer choice is:

• D. m∠ADC = 180° - m∠ABC