Question

4. The coordinates of rectangle PQRS are P(1,6),Q(1,2),R(9,2) and S(9,6). Show that the diagonals are equal in length.

Answer 1

These are the points graphed:

Are they equal? Yes.

Answer 2

If you use the distance formula to calculate the length of each diagonal, you will find they are equal at around 8.9