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# Geo_3.1

### Vocabulary for Geometry_3.1

TermDefinition
dilation A transformation that enlarges or reduces the original figure proportionally.
enlargement An image that is larger than the original figure.
proportions An equation of the form a/b = c/d that states two ratios are equal.
ratio A comparison of two quantities using division.
reduction An image that is smaller than the original figure.
scale factor The ratio of the lengths of two corresponding sides of two similar polygons or two similar solids.
similar polygons Polygons that have exactly the same shape, but not necessarily the same size.
AA Similarity Postulate If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.
SSS Similarity Theorem f the corresponding side lengths of two triangles are proportional, then the triangles are similar.
SAS Similarity Theorem If the lengths of two sides of one triangle are proportional the the lengths of two corresponding sides of another triangle and the included angles are congruent, then the triangles are similar.