The big idea Review the scale-factor, similarity, and proportionality rules before taking the 60-point quiz in Canvas.
One-card recap
Dilation from the origin: (x, y) → (kx, ky)
k = image/pre-image. k > 1 enlarges. 0 < k < 1 reduces.
Similar figures have congruent corresponding angles and proportional corresponding sides. The triangle tests are AA, SAS similarity, and SSS similarity.
A line parallel to one side of a triangle divides the other sides proportionally. An altitude to a right triangle's hypotenuse creates three similar right triangles.
Same-number trap: 2 and 1/2 can both appear in the choices. Read which figure is the image before choosing k.
Mixed practice
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