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Similar

Corresponding angles are the same and sides are proportional.

Proportional

Comparing two quantities using a ratio.

Ratio

A comparison of 2 similar quantities.

Proportion

A number that compares two object's measurements.

SSS~ postulate

 If two triangle's corresponding sides are proportional, then they are similar.

SAS~ Postulate

 If the corresponding sides are proportioal and the angle between those sides are congruent between two triangles, then thay are similar.

AA~ Postulate

 If two angles in a triangle correspond to two angles in another triangle, then they are similar triangles.

 Corresponding angles and sides

 Similarly positioned angles and sides.

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