This document provides instructions on how to calculate the area of a parallelogram. It defines key terms like base and height, and explains that the area of a parallelogram can be calculated by multiplying the base and height. It provides examples of calculating areas when given the base and height in different units. Students are advised to show their work and use consistent units when solving area problems.

1. 11.4 Area of Parallelograms What you’ll learn: Find the area of parallelograms Remember a parallelogram is a quadrilateral with opposites sides parallel and opposite sides congruent.

2. New Vocabulary Base: any side of the parallelogram base

3. New Vocabulary Height: the length of the segment perpendicular to the base with endpoints on opposite sides. ( This is “how tall” the parallelogram is.) height

4. Area The area A of a parallelogram equals the product of its base b and its height h. A=bh

5. Find the Area The first thing that you need to do is write down the formula that you will be using. A=bh

6. Find the Area Find the area of a parallelogram with base 15 cm and height 4 cm. A=bh A=15(4) A= 60 square centimeters A= 60cm2 Remember that area is given in square units!

7. Find the Area A= bh A= 18(12) A= 216 in2 12 in 18 in

8. Your Turn 1. b= 10 in h=5 in 2. b= 8 cm h= 10cm

9. Watch Out Be sure that the base and height are given in the same unit before you find the area. b= 1 ft h= 18 in You need to use : b=12 in h=18 in or b= 1 ft h= 1.5 ft

10. Homework Practice workbook Lesson 11-4. Be sure to show all of your work. No work=No credit