1. Areas of Trapezoids
Geometry
Unit 4, Lesson 2

2. Trapezoids The bases of a trapezoid are the parallel sides
The legs are the non-parallel sides
The height is the perpendicular distance between the two parallel bases.
base (b1)
leg
height (h)
leg
Base (b2)

3. Theorem 5-8: Area of a Trapezoid
The area of a trapezoid is half the product of the height and the sum of the lengths of the bases.
A = ½ h(b1 + b2)

4. Example:
Find the area of a trapezoid with the height of 7 cm, and bases of 12 cm and 15 cm.

5. Example: 5 4 2 5
Area = 20.8

6. Real World Example
Approximate the area of Arkansas by finding the area of the trapezoid shown.

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