1. 1-3 Using Formulas Objectives: To solve problems using formulas.
To find a maximum area for a rectangle of a given perimeter.

2. Vocabulary
Area
Perimeter
Interest

3. Word Problems
Mr. Mackenzie’s patented system for solving word problems:
Guess and check!!
Write down your check.
Replace your guess with a variable.

4. Area of Rectangles
AR = lw

5. Example 1 Find the area of the following rectangles.
l = 80 cm, w = 28 cm
l = 38 cm, w = 14 cm

6. Example 2
Notice what type of shape has the maximum area? Hint: the square.

7. Example 3

8. Homework
1-3 Worksheet