Question

ABC is an isosceles triangle
Please can someone help

Answer 1

Base angles in an isosceles triangle are equal.

Angle in triangle adds to 180

Triangle BADB

180- 72=108

108/2=54

Angle BAB And BDA is 54

Angle on straight lines adds to 180

180-54=126

Angle BDC is 126

180-126=54

54/2 =27

Angle DBC and DCB is 27

Now forget line BD exist, creating triangle ABCA and with the values you've found, use it to see if all angles adds up to 180.

DBC is 27 adds to 72. Add this to angle BAD (54) and BCD (27)

27 +72=99

54+27=81

99+81=180