Ms. Drake 7th grade Math Fractions Lesson 46 Scale Drawings and Scale Models.

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Presentation transcript:

Ms. Drake 7th grade Math Fractions Lesson 46 Scale Drawings and Scale Models

Vocabulary Corresponding Angles Corresponding Sides Cross Product Equivalent Ratios Indirect Measurement

Vocabulary Proportion Rate Ratio Scale Scale Drawing

Vocabulary Scale Factor Scale Model Similar Unit Rate

Scale Drawings and Scale Models A scale model is a proportional model of a three-dimensional object

Its dimensions are related to the dimensions of the actual object by a ratio called the scale factor. A scale is the ratio between the two sets of measurements

Identify the scale factor.

A photo of this famous painting measures 6.13 cm by 4.9 cm. The scale factor is 1/15. Find the size of the actual painting.

On a map, the distance between two cities in 10.5 cm. What is the actual distance if the map scale is 3 cm = 80 mi?

Until next time… Find the scale factor

Find the length of the actual sofa.

Identify each scale factor.