Find Actual Measurements

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Scale Drawings and Scale Models

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Presentation transcript:

Find Actual Measurements MAP A map has a scale of 1 inch = 8 miles. Two towns are 3.25 inches apart on the map. What is the actual distance between the two towns? Method 1 Use a proportion. Let x represent the actual distance between the two towns. Write and solve a proportion. map distance → actual distance → ← map distance ← actual distance Find the cross products. Simplify. Answer: The actual distance between the two towns is 26 miles.

Method 2 Use the Unit Rate. Answer: The actual distance is 1,647,360 inches or 26 miles. Find the scale factor. Convert 8 miles to inches. So, the actual distance is 506,880 times the map distance (a = 506,880m). a = 506,880m Write the equation. = 506,880(3.25) Substitute m = 3.25 = 1,647,360 Simplify.

SCALE DRAWING A scale drawing of a new house has a scale of 1 inch = 4 feet. The height of the living room ceiling is 2.75 inches on the scale drawing. What is the actual height of the ceiling? A. 1.45 feet B. 48 feet C. 11 feet D. 6.88 feet

Find the cross products. Answer: The scale is 1 inch = 3 feet Determine the Scale MODEL CAR A model car is 4 inches long. The actual car is 12 feet long. What is the scale of the model? Write the ratio of the length of the model to the actual length of the car. Then solve a proportion in which the length of the model is 1 inch and the actual length is x feet. model length → actual length → ← model length ← actual length Find the cross products. Answer: The scale is 1 inch = 3 feet Simplify. Divide each side by 4. Simplify.

LOG CABIN A model log cabin is 12 inches high LOG CABIN A model log cabin is 12 inches high. The actual log cabin is 42 feet high. What is the scale of the model? A. 1 inch = 3.5 feet B. 1 inch = 42 feet C. 2 inches = 7 feet D. 1 inch = 3.5 inches

Construct a Scale Drawing PATIO DESIGN Sheila is designing a patio that is 16 feet long and 14 feet wide. What size should the patio be on the blueprint? Use a scale of 0.5 inch = 4 feet. Step 1 Find the measure of the patio’s length on the drawing. Let x represent the length. drawing length → actual length → ← drawing length ← actual length Find the cross products. Simplify. 2 = x Divide each side by 4. On the drawing, the length is 2 inches.

Step 2. Find the measure of the patio’s width on the drawing Step 2 Find the measure of the patio’s width on the drawing. Let w represent the width. drawing length → actual length → ← drawing length ← actual length Find the cross products. Assignment