1. Trapezoids
Did you know that the word trapezoid comes from the Greek “τραπέζιον” (or trapeza) meaning “table,” with the suffix –oid meaning “to resemble?” Hmmm…

2. Definition of trapezoid…
Trapezoid: a quadrilateral consisting of exactly one pair of parallel sides. OR a quadrilateral with two parallel sides of unequal length.
Using this definition, is a square also a trapezoid? A rectangle? A parallelogram?

3. A = ½ h(b1 + b2) Trapezoids: b1 = base 1 h = height leg leg
Height – distance between the 2 bases.
* Must be 
b2 = base 2
base
base
Area of trapezoid
A = ½ h(b1 + b2)
Height

4. Ex. 1 Find the area of the following trapezoid.
This is the height!!
30in
18in
36in
A = ½ h(b1 + b2)
= ½ (18in)(36in + 20in)
= ½ (18in)(56in)
= 504in2

5. What happens if you are given the area, but are missing one of the bases?
A = 22 in2
7 in

6. Find the height of the trapezoid.
35 m
= 23 m h
A = m2
55 m