Frequently Asked Questions
What makes two triangles similar?
All corresponding angles match, equivalently all corresponding sides are proportional. Any of SSS, SAS, or AA implies similarity.
Similar versus congruent?
Similar triangles have the same shape (equal angles, proportional sides). Congruent triangles also have the same size, that is, scale factor exactly 1.
How do areas scale?
Area scales as the square of the linear scale factor. Two similar triangles with scale factor 3 differ in area by a factor of 9.
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