Similarity
Ratio, proportion and scale factor; similar polygons; the AA·SSS·SAS similarity shortcuts; the side-splitter theorem; perimeter and area ratios; and dilations with indirect measurement.
Builds on
Triangle congruence and the angle sum (Unit 4), parallel-line angle facts (Unit 3), the midsegment (Unit 5), and ratios & proportions from Grade 6.
Lessons