In triangle DEF shown below, points A, B and C are taken on DE, DF and EF respectively such that EC = AC and CF = BC. If angle D =40° then what is the angle ACB in degrees?

In triangle DEF shown below, points A, B and C are taken on DE, DF and EF respectively such that EC = AC and CF = BC. If angle D =40° then what is the angle ACB in degrees?

A 140

B 70

C 100

D None of them

Solution

Correct Answer: Option C