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8-1 Ratios and ProportionsPowerPoint Presentation

8-1 Ratios and Proportions

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8-1 Ratios and Proportions

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8-1Ratios and Proportions

Four Key Terms

Two Properties

Proportion

A statement that two ratios are equal.

and

Extended proportion

Written form of three or more ratios are equal.

Cross-Product Property

(1)

(2)

(3)

(4)

Scale drawing

Scale

A drawing in which all lengths are proportional to corresponding lengths.

A comparison of each length in a drawing to the actual length.

A photo that is 8 in. wide and 10 in. high is enlarged to a poster that is 2 ft. wide and 2.5 ft. high. What is the ratio of the height of the photo to the height of the poster?

(1)

(2)

(3)

(4)

Cross-Product Property

Cross-Product Property

- You want to make a new scale drawing with a scale of 1 in. = 4 ft. What would be the dimensions of your 14 ft.-by-10 ft. bedroom in this scale drawing?