LEARNING GOALS – LESSON 7:5 Warm Up Convert each measurement a. 6 ft 3 in. to inches b. 5m 38 cm to centimeters Find the area and perimeter of a square with sides of length 13 cm. Find the area and perimeter of a rectangle with sides of 5.8m & 2.5m. LEARNING GOALS – LESSON 7:5 7.5.1: Use ratios to make indirect measurements. 7.5.2: Use scale drawings to solve problems. 7.5.3: Use rations to find perimeter and area ______________ measurement is any method that uses: Example 1: Measurement Application This here is a picture of Larry. Larry claims that the fish he caught were a total of 6.5 ft in length! If Larry is actually 5’ 11”, use indirect measurement to determine if he is fibbing.

Example 2A: Solving for a Dimension A ___________ drawing represents an object as smaller than or larger than its actual size. The drawing’s scale is the ___________ of any length in the drawing to the corresponding actual length. Example 2A: Solving for a Dimension On a Wisconsin road map, Kristin measured a distance of 11⅛ in. from Madison to Wausau. The scale of this map is 1inch:13 miles. What is the actual distance between Madison and Wausau to the nearest mile? Find the actual distance between City Hall and El Centro College. Example 2B: Making a Scale Drawing The rectangular central chamber of the Lincoln Memorial is 70 ft long and 60 ft wide. Make a scale drawing of the floor of the chamber using a scale of 1 in.:20 ft.

Example 3: Using Ratios to Find Perimeters and Areas A. Given that ∆LMN ~ ∆QRT, find the perimeter P and area A of ∆QRS. ∆ABC ~ ∆DEF, BC = 4 mm, and EF = 12 mm. If P = 42 mm and A = 96 mm2 for ∆DEF, find the perimeter and area of ∆ABC.