How do you write coordinate geometry proofs.

1) You must know the distance formula, slope formula and midpoint formula.

2) You must know the key properties of the quadrilaterals.

Hint: USE the graph!!!

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Common ways to show a quadrilateral is a….

•Parallelogram – Opposite sides are congruent and parallel

•Rectangle- Parallelogram with congruent diagonals (not perpendicular) & right angles

•Rhombus – Parallelogram with congruent sides and non congruent

**perpendicular**diagonals•Square – Parallelogram with congruent, perpendicular diagonals

•Isosceles Trapezoid – one pair of parallel sides and one pair of congruent non parallel sides. Diagonals not congruent