Question

Triangle ABC is isosceles triangle and ab=BC and angle B= angle C=80 degree
Find angle x

Answer 1

Answer:

Simply sum of internal angles of a triangle is 180 so

Angle A + angle B + angle C = 180

80 + 80 + x = 180

160 + x = 180

x = 180 - 160 = 20 answer

Answer 2

Answer:The answer is 60°

If E and D are the mid point of

AB and AC respectively. By mid point theorem ED will be parallel to BC

And then,

x = 60° (alternate interior angle)