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Videos, worksheets, stories and songs to help Grade 8 students learn about Scale Factor.

In this lesson, we will learn the scale factors of similar figures, the ratio of lengths, perimeters, areas and volumes of similar figures.

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More Lessons for Grade 8 math

More Geometry Lessons

Define scale factor. Use scale factor to sketch a proportional scale model.

Scale factor is a ratio comparing the scaled measurement to the actual measurement.

1. The scale factor of a model car is 1:24. If the actual car is 18 ft long and 8 ft wide, how long and wide will the model car be in inches?

2. You need to sketch a ladybug using a scale factor of 12. If a ladybug is 8 mm long and 4 mm wide, what will be the length and width of the sketch be in cm?

A brief course in scale factor for similar geometric figures

Scale Factor is defined as the ratio of any two corresponding lengths in two similar geometric figures.

Ratio of perimeters = ratio of sides

Ratio of areas = (ratio of sides)

Scale Factor/Perimeter Ratio/Area Ratio

Given that the polygon in each pair are similar. Find the scale factor, perimeter ratio and area ratio.

Areas and Perimeters of Similar Figures

This video discusses how to find the ratio of the perimeters and the ratio of the areas of similar figures from the scale factor. Also how to use these ratios to find missing perimeters and areas.

Scale factor effect on area and perimeter

Ratio of lengths = ratio of sides = scale factor

Ratio of surface areas = (ratio of sides)

Ratio of volume = (ratio of sides)

Similar Figures, Scale Factor, Area & Volume Ratios

Similar Figures, Scale Factor, Area & Volume Ratios

3D Figures - Scale Models and Factors

Learn about scaling 3D figures using scale factor

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