Question

ABCD is a quadrilateral. E is a point in ABCD.
Prove that,
           (AEB) (DEC) - (AED) (BEC) = (AEC) (BED)
                                            or,
           (AEB) (DEC) - (AED) (BEC) = -(AEC) (BED)

Question is right...

Accepted Answer

This is not true - take a square, for instance, and you will get 90*90
- 90*90 and it is definitely not equal to 180*180.

Question #71752

Expert's answer