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# 7.2 writing and solving proportions 2

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### 7.2 writing and solving proportions 2

1. 1. 7.2 Writing and Solving Proportions Day 2
2. 2. Essential Questions <ul><li>What is the connection between a ratio and a fraction? </li></ul><ul><li>Why are ratios and proportions important? </li></ul><ul><li>How are scale drawings, models, and proportions used in everyday life? </li></ul>
3. 3. <ul><li>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. </li></ul><ul><li>This might mean “scale to actual” is 1 to 10 or the actual object is 10 times larger. </li></ul>
4. 4. <ul><li>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? </li></ul><ul><li>Scale </li></ul><ul><li>Actual </li></ul>
5. 5. <ul><li>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? </li></ul><ul><li>Scale </li></ul><ul><li>Actual </li></ul>
6. 6. Similar Polygons <ul><li>Similar polygons have the same shape but not necessarily the same size. They are, however, proportional. </li></ul>
7. 7. <ul><li>Find the missing length using proportions </li></ul>30 45 25 n
8. 8. Find the missing side 15 37.5 30 y
9. 9. Homework <ul><li>Page 351 #25-28, 39-41, 43A </li></ul>