1. Holt Geometry 1-5 Using Formulas in Geometry 1-3 Using Formulas in Geometry Holt Geometry Lesson Presentation Lesson Presentation

2. Holt Geometry 1-5 Using Formulas in Geometry 1.Solve problems by using formulas. 2.Find maximum area of a rectangle for a given perimeter. Objective 1-3

3. Holt Geometry 1-5 Using Formulas in Geometry Problem-Solving Plan: (1) Explore the problem. (2) Plan the solution. (3) Solve the problem. (4) Examine the solution. 1-3

4. Holt Geometry 1-5 Using Formulas in Geometry Perimeter is expressed in linear units, such as inches (in.) or meters (m). Area is expressed in square units, such as square centimeters (cm 2 ). Remember!

5. Holt Geometry 1-5 Using Formulas in Geometry Find the perimeter and area of each figure. Example 1A: Finding Perimeter and Area = 2(6) + 2(4) = 12 + 8 = 20 in. = (6)(4) = 24 in 2

6. Holt Geometry 1-5 Using Formulas in Geometry Example 2 One type of pet enclosure is made up of 12 sections of fencing, connected by hinges. This enclosure folds for easy storage and is flexible for making different-sized areas in which your pet can play. Suppose the sections are positioned to make a rectangle. What are the dimensions of the rectangle that provide the maximum area for your pet?

7. Holt Geometry 1-5 Using Formulas in Geometry Example 3 A formula for computing simple interest is I = prt, where I is the interest earned, p is the principal (or the amount of money invested), r is the rate of interest (expressed as a decimal value), and t is the length of time in years it is invested. Soledad offered to lend her younger sister Lola $200 at a 3.5% interest rate. She told Lola that her loan would cost Lola $217.50 at the end of the loan period. How long is Soledad giving Lola to pay back the loan?

8. Holt Geometry 1-5 Using Formulas in Geometry Homework Pg.22-24 (1-9all, 16-38E)