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Back to Triangle similarity criteria (AA, SAS, SSS) and proportional sides — Problem 6 · Task Set 2

Triangle Similarity — AA, SAS, SSS — and Proportional Sides

Grade 10·22 problems·~30 min·ACT Math·topic·act-geo-tri-similar
Work through problems with immediate feedback
A

Fluency Practice

1.

△ABC∼△DEF\triangle ABC \sim \triangle DEF with scale factor k=3k = 3 (where k=AB/DEk = AB/DE). If AC=21AC = 21, find DFDF.