Blow up a solid by a scale factor. A section of a larger playlist on basic geometry introduces the ratios of the surface areas and volumes of similar solids. Using the ratios, the video works several examples involving similar figures.

Concepts

similar figures, similarity, 3-d, 3-d figures, solids, surface area, volume, ratios, scale factors

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Additional Tags

math

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Instructional Ideas

• Create nets of similar solids to show the ratio of the surface area
• Lead a discussion on what types of questions do not require the surface area or volume formulas

Classroom Considerations

• Assumes individuals understand the concept of similarity

• This video is hosted on YouTube

Pros

• Links to more resources on similar solids
• Includes the algebraic steps in working the examples

Cons

• None