Distance Formula

Formula used to find the distance between two points on a graph.

Midpoint Formula

The point exactly in the middle of a segment.

Slope Formula

Slope is the change in y divided by the change in x (rise over run) of a line on a graph.

Pythagorean Theorem

If a triangle is a Right Triangle, then you can use the Pythagorean Theorem to help solve for a missing side length.

Properties of a Parallelogram

• Opposite sides are congruent.
• Opposite angles are congruent.
• Consecutive angles are supplementary (= 180°).
• The diagonals bisect each other.

​

Properties of a Rectangle

• A rectangle is a Parallelogram.
• Each interior angle is 90 degrees.
• Diagonals are congruent.

Properties of a Rhombus

• A Rhombus is a Parallelogram.
• All sides are congruent.
• Diagonals are perpendicular.
• Diagonals bisect the angles of a rhombus.

Properties of a Square

• A squares is a parallelogram.
• A square is a rhombus.
• A square is a rectangle.

​

Properties of a Trapezoid

A quadrilateral with ONE pair of parallel sides (bases).

Isosceles Trapezoid

• Non parallel sides are congruent.
• Lower base angles are congruent.
• Upper base angles are congruent.
• Any lower base angle is supplementary to any upper base angle.
• The diagonals are congruent.

Properties of a Kite

• Two pairs of consecutive, congruent sides
• Congruent non-vertex angles
• Diagonals are perpendicular.

Equation of a Circle

Circumcenter

The point of concurrency (intersection) of the perpendicular bisectors of a triangle.

Incenter

The point of concurrency (intersection) of the angle bisectors of a triangle.

Centroid

The point of concurrency (intersection) of the three medians of a triangle.

-Center of Gravity

Orthocenter

The point of concurrency (intersection) of the three altitudes of a triangle.