Unit 7: Similarity Vocab

similar triangles

Triangles in which corresponding angles are congruent and corresponding sides are proportional (ratios equal)

proportional

equal ratios

corresponding sides and angles

the matching sides and angles of similar or congruent figures

AA Similarity Theorem

If two angles of one triangle are congruent to two angles of another, then the triangles are similar

SAS Similarity Theorem

If an angle of one triangle is congruent to an angle of another triangle and the sides including those angles are proportional, then the triangles are similar.

SSS Similarity Theorem

If the corresponding side lengths of two triangles are proportional, then the triangles are similar.

ratio

comparison of two numbers or quantities, often expressed as a fraction.

In similar triangles, corresponding sides are…

proportional

In similar triangles, corresponding angles are…

congruent

scale factor

the ratio of the lengths of two corresponding sides of similar polygons

dilation

a transformation that reduces or enlarges a figures by a scale factor

midsegment

a segment in a triangle that connects the midpoints of two of its sides