Question

4. Prove that :
(1) A ABD – A ACD
(ii) B. 20
(ii) ZADB = ADC
(iv) ZADB = 90​

Answer 1

Answer:

in triangle ABD and triangle ACD

AB=AC

BD=CD

AD=AD

by SSS criteria of congruence

triangleABD congruent to triangle ACD

angle B=angle C

angle ADB=angle ADC

ADC+ADB=180

ADB=90