The document discusses proportions and scale drawings. It explains that scale drawings show shape but not actual size, and a scale gives the ratio between measurements in a drawing and reality. It then provides examples of using scales and proportions to find actual distances and lengths based on maps and scale drawings.

1. 7.2 Writing and Solving Proportions Day 2

2. Essential Questions What is the connection between a ratio and a fraction? Why are ratios and proportions important? How are scale drawings, models, and proportions used in everyday life?

3. A scale drawing shows the shape of an object but not the actual size. A scale give the ratio of the measurements in the drawing – such as 1:10 scale. This might mean “scale to actual” is 1 to 10 or the actual object is 10 times larger.

4. A map states that 1 in = 50 miles. If the distance on the map between two cites is 2.8 inches, how far actually are the two cities apart? Scale Actual

5. Lady bugs average 0.4 inches in length. A scale drawing of a ladybug will be made using a scale of 10:1 (model to actual). What will the length of the ladybug be in the drawing? Scale Actual

6. Similar Polygons Similar polygons have the same shape but not necessarily the same size. They are, however, proportional.

7. Find the missing length using proportions 30 45 25 n

8. Find the missing side 15 37.5 30 y

9. Homework Page 351 #25-28, 39-41, 43A