1-3 Using Formulas Objectives: To solve problems using formulas.

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Presentation transcript:

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

Vocabulary Area Perimeter Interest

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

Area of Rectangles AR = lw

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

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

Example 3

Homework 1-3 Worksheet