Why is the angle sum property not applicable to concave quadrilateral?(please explain briefly and if possible with proof and example)

Thank you.

Asked by hk.sachdev | 9th Jan, 2019, 08:56: PM

Expert Answer:

The question which you have posted is answered in the video.
 
Please go through it
 

Answered by Sneha shidid | 10th Jan, 2019, 11:36: AM