Answers

2016-01-05T18:14:10+05:30
It can be proved by two methods using 3D or vector method but the better one is 3D method calc. AB,BC,CD,DÀ then find d.c's of AB and BC show that their multiplication is zero.
0
2016-01-11T16:25:29+05:30
You can find this using distance formula ..it is easy .if AB= BC= CD= AD then it is a square
0