Area of Trapezoids
A trapezoid has one pair of parallel sides. Its area uses both bases and height.
Do this: Read the concept below, then try the quiz or activity.
Lesson 179 of 215
Concept
Area formula: A = 1/2 x (b1 + b2) x h
Where: - b1 and b2 are the parallel bases - h is perpendicular height
Example: b1=8, b2=12, h=5 A = 1/2 x (8+12) x 5 A = 1/2 x 20 x 5 A = 50 square units
Think of a trapezoid as an averaged-width rectangle: average base = (b1+b2)/2
Try it
Practice: Area of Trapezoids.