Question

Answer the question 4.a,b,c

Answer 1

Hope it's helpful.......

Answer 2

4.
a) in ABC and DBC
BC=BC(common)
AB=BD(given)
AC=CD(given)
ABC is congruent to DBC by SSS criteria for congruency

b)as ABC congruent to DBC
angle ABC=angle DBC (By CPCT)
and angle ACB=angle DCB (By CPCT).
Therefore, BC bisects angle ABD and angle ACD

c)As ABC is congruent to DBC
angle A=angle D

Hence proved.