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.

Recent Articles

  1. How to Write an Inequality

    Dec 12, 19 07:51 AM

    Learn how to write an inequality quickly with this easy to follow math lesson.

    Read More

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

Real Life Math Skills

Learn about investing money, budgeting your money, paying taxes, mortgage loans, and even the math involved in playing baseball.