Trapezoid

See how to solve a trapezoid
(angles/median/diagonals/area).
5 examples and their solutions.

Trapezoid: Definition

A trapezoid is a quadrilateral
that have a pair of parallel sides.
Base: Parallel sides
Legs: Non-parallel sides

m∠1 + m∠2 = 180
m∠1' + m∠2' = 180

Solution

The median of a trapezoid is a line segment
that connects the midpoints of the legs.

m = 12(b₁ + b₂)

Solution

An isosceles trapezoid is a trapezoid
whose legs and base angles are congruent.

Isosceles Triangle

m∠1 = m∠1'
m∠2 = m∠2'

m∠[blue] + m∠[green] = 180

m∠A, m∠B, m∠C = ?

Solution

BD = ?

Solution

A = 12(b₁ + b₂)h

Solution