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# Formulas & Theorems

### FINAL

TermDefinition
diagonal segment joining any two nonconsecutive vertices in a quadrilateral
parallelogram special kind of quadrilateral in which both pairs of opposite sides are parallel
opposite sides of a parallelogram are congruent
opposite angles of a parallelogram are congruent
consecutive angles in a parallelogram are supplementary
diagonals of a parallelogram bisect each other
quadrilateral is parallelogram if #1 both pairs of opposite sides are parallel
quadrilateral is parallelogram if #2 both pairs of opposite sides are congruent
quadrilateral is parallelogram if #3 pair of opposite sides are both parallel and congruent
quadrilateral is parallelogram if #4 diagonals bisect each other
quadrilateral is parallelogram if #5 both pairs of opposite angles are congruent
rectangle quadrilateral with four right angles
rectangle property that make is a parallelogram #1 opposite sides are congruent
rectangle property that make is a parallelogram #2 opposite angles are congruent
rectangle property that make is a parallelogram #3 consecutive angles are supplementary
rectangle property #1 all four angles are right angles
rectangle property #2 diagonals are congruent
rhombus quadrilateral with four congruent sides
square quadrilateral with four right angles and four congruent sides
diagonals of a rhombus are perpendicular
each diagonal of a rhombus bisects a pair of opposite angles
trapezoid quadrilateral with exactly one pair of parallel sides
parallel sides of trapezoids are called bases
nonparallel sides of trapezoids are called legs
isosceles trapezoid trapezoids legs are congruent
segment that joins the midpoints of the legs of the trapezoid is called median
both pairs of base angles of an isosceles trapezoid are congruent
diagonals of an isosceles trapezoid are congruent
median of a trapezoid is parallel to bases
median formula for trapezoids one half the sum of the measures of the bases
Created by: 2018grellerj