The key to understanding is making connections. Scholars explore angle dilations using properties of parallel lines. At completion, pupils prove that angles of a dilation preserve their original measure. 

Concepts

scale factors, dilations, congruent angles, proportions

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Additional Tags

math

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Instructional Ideas

• As a time saver, divide the class into groups for the exploration and assign a problem to each group; have groups share their conclusions on the board
• Ask pupils to write proportionality statements to verify scale factors

Classroom Considerations

• Review properties of parallel lines cut by a transversal to aid in the understanding of dilated angles
• A continuation of a 36-part series

Pros

• Emphasizes unit vocabulary
• Provides ideas to help struggling learners

Cons

• None

Common Core

HSG-SRT.A.1.a HSG-SRT.B.4 MP3 MP7