Help with geometry? Coordinate geometry proofs?

I need some help with geometry. I literally have no clue how to do it. There's two questions I need help with. Both need a proof for them. 1. Use coordinate geometry to prove that the quadrilateral OPQR with vertices O (0,0),P (9,3), Q (9,8), R (-3,4) is an isosceles trapezoid. 2.Use coordinate geometry... show more I need some help with geometry. I literally have no clue how to do it. There's two questions I need help with. Both need a proof for them.

1. Use coordinate geometry to prove that the quadrilateral OPQR with vertices O (0,0),P (9,3), Q (9,8), R (-3,4) is an isosceles trapezoid.

2.Use coordinate geometry to prove that quadrilateral PART with vertices P (-2,1), A (1,4), R (4,1), and T (1,-2) is a square.

Thanks for your help and have a wonderful day.
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