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Quadrilateral
4 sided polygon

Trapezoid
a quadrilateral with at least one pair of opp sides that are parallel

Isosceles trapezoid
a trapezoid with = diagonals

Kite
a quadrilateral with two consecutive = sides

Parallelogram
a quadrilateral with both pairs of opposite sides parallel

Rectangle
a quadrilateral with 4 rights angles

Rhombus
a quadrilateral with four = sides
Square
a quadrilateral with four equal sides and four right angles
Midpoint formula
To prove that diagonals bisect each other.
Distance formula
To prove equal sides, or equal diagonals.
Slope formula
To prove lines are parallel, or perpendicular to each other.
Interior angle sum
180(n-2)°
Exterior angle sum
360°
One interior angle of a regular polygon
180(n-2) /2°
One exterior angle of a regular polygon
360/n°