Warm Up

• Suppose you have a roll of 33¢ stamps and a roll of 15¢ stamps. You need to mail a package that will cost $1.77. What combination of stamps can you use to get exactly $1.77?

Solution

• Four 33¢ stamps and three 15¢ stamps equals $1.77 in postage.

Area of Parallelograms

Lesson 11-4

Area of Parallelograms

• In the Activity we found that the area of a parallelogram is similar to the area of a rectangle.

• The area of a rectangle is l x w

Parallelogram

h

b

Find the area of a parallelogram A = bh

Remember the units when finding area of any figure are always SQUARED!!

12cm

15cm

•A = bh

•A = 15cm x 12cm

•A = 180 cm ²

Find the area of the figure round to the nearest tenth if necessary.

0.75m

1.5m

•A = bh

•A = 1.5m x 0.75m

•A = 1.1 m ²

Find the area of the figure round to the nearest tenth if necessary.

2yd

3 ½ yd

•A = bh

•A = 3 ½ yd x 2 yd

•A = 7 yd²

Find the area of the figure round to the nearest tenth if necessary.

7.9cm

7.2cm

•A = bh

•A = 7.2cm x 7.9cm

•A = 56.9 cm ²

Find the area of the figure round to the nearest tenth if necessary.

Don’t Forget

• Homework: Lesson 11-4 # 1-14 all

• Quiz: Next Tuesday on Lessons 11-3 Pythagorean Theorem and 11-4 Area of Parallelograms