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Mathematics 115 Online
OpenStudy (anonymous):

Prove that a line parallel to one side of a triangle divides the other two sides proportionally. Be sure to create and name the appropriate geometric figures.

OpenStudy (anonymous):

This is the answer I came up with, is it correct? :: Angles C and E are congruent because they are corresponding angles. Triangle ADE is similar to triangle ABC because 2 angles are congruent (AA postulate) Similar triangles have proportional sides.

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