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TSR Wiki > Study Help > Subjects and Revision > Revision Notes > Mathematics > Intercept Theorem

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(diagram missing illustrating this point)

If CB and DE are parallel, the ratio of CD to DA and the ratio of BE to EA are equal. In other words, CD/DA = BE/EA . This is often a useful way of solving triangle problems and can be derived from the properties of similar triangles.

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Perhaps more context is needed for this article - examples might be good, as would prerequisite topics, or related extension topics.