Title: Lesson 14-1
Author: mark_cameron
Last saved by: gtsmith
Company: McGraw-Hill

Lesson 10-3

Example 1 Find Areas of Parallelograms
Find the area of the parallelogram.

The base is 
3 units, and the height is 6 units.

A = bh	Area of parallelogram	
A = 3 ⋅ 6	Replace b with 3 and h with 6.
A = 18		Multiply.	

The area is 18 square units or 18 units^2.

Example 2 Find Areas of Parallelograms
Find the area of the parallelogram.

	Estimate A ≈ 15 ∙ 10 or 150 in^2

A = bh	Area of parallelogram	
A = 15 ⋅ 9	Replace b with 15 and h with 9.
A = 135	Multiply.		

The area is 135 square inches or 135 in^2.

Check for Reasonableness Compare 135 with the estimate. 135 ≈ 150 ✓

Example 3 Real-World Example
FLAGS   An amusement park is designing a new flag for its entrance. The new flag is in the shape of a parallelogram with a base of 83/4 feet and a height of 51/2 feet. Estimate the area of the new flag.

The flag is a parallelogram, so use the formula A = bh. Since an estimate is wanted, round the base and height to the nearest foot.

83/4 ft ≈ 9 ft		51/2 ft ≈ 6 ft

A = bh	Area of parallelogram
A ≈ 9 ∙ 6	Replace b with 9 and h with 6.
A ≈ 54	Multiply.	

The area of the new flag is about 54 square feet.