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# 7.2 writing and solving proportions 2

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### Transcript

• 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