Similar Shapes and Scale Drawings

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Similar Shapes and Scale Drawings

Warm Up Solve the proportions for x. 𝑥 5 = 18 30 2. 3 9 = 𝑥 3 8 𝑥 = 14 7 4. 5 6 = 𝑥 15 5. 81 33 = 𝑥 5.5 6. 𝑥 4 = 27 18

In Pete’s blueprint the length of a side wall is 16 inches In Pete’s blueprint the length of a side wall is 16 inches. Find the actual length of the wall. The back wall of the house is 33 feet long. What is the length of the back wall in the blueprint? How do you know your answers are reasonable?

The art class is planning to paint a mural on an outside wall The art class is planning to paint a mural on an outside wall. This figure is a scale drawing of the wall. What is the area of the actual wall?

Write the scale as a unit rate Write the scale as a unit rate. Show that this unit rate is equal to the ratio of the height of the drawing to the actual height. Write the ratio of the area of the drawing to the area of the actual mural. Write your answer as a unit rate. Show that this unit rate is equal to the square of the unit rate from the above question. How could you have done the original problem without having to determine the number of feet represented by one inch?

The drawing plan for an art studio shows a rectangle that is 13 The drawing plan for an art studio shows a rectangle that is 13.2 inches by 6 inches. The scale in the plan is 3 in.:5 ft. Find the length and width of the actual studio. Then find the area of the actual studio.

Find the actual length and width of the hall using the original scale Find the actual length and width of the hall using the original scale. Then find the actual length and width of the hall using the new scale. How do you know your answers are correct? Explain how you know that there is a proportional relationship between the first and second drawings.