Area of a trapezoid


This lesson will show how we find the area of a trapezoid by using the formula you see below the trapezoid



Area of a trapezoid formula
Example #1:

If b1 = 7 cm, b2 = 21 cm, and h = 2 cm, find A

(b1 + b2)/2 = (7 + 21)/2 = 28/2 = 14

A= 14 × 2 = 28 cm

Example #2:

If b1 = 15 cm, b2 = 25 cm, and h = 10 cm, find A

(b1 + b2)/2 = (15 + 25)/2 = 40/2 = 20

A= 20 × 10 = 200 cm

Example #3:

If b1 = 9 cm, b2 = 15 cm, and h = 2 cm, find A

(b1 + b2)/2 = (9 + 15)/2 = 24/2 = 12

A= 12 × 2 = 24 cm

Area of a trapezoid quiz to find out if you really understand this lesson.


Buy a comprehensive geometric formulas ebook. All geometric formulas are explained with well selected word problems.





New math lessons

Your email is safe with us. We will only use it to inform you about new math lessons.

Follow me on Pinterest


Page copy protected against web site content infringement by Copyscape

Recent Articles

  1. Number Game

    Dec 01, 16 06:27 AM

    1. Think of any positive whole number. No fractions, no decimals,no percents. 2. Double that number. 3. Add 10 to that result in step 2. 4. Divide

    Read More