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.

Question

directrix · Answer

Is this a proof from scratch? That is, nothing given other than the theorem to be proved.

dontknowdontcare · Answer

I honestly don't know I'm totally stumped on this. I do FLVS and this was the question

directrix · Answer

Okay.

We'll be proving the 	Triangle Proportionality Theorem.

dontknowdontcare · Answer

Okay, so we are writing a proof.

directrix · Answer

Given: △ RST; Line PQ // Line RS

Prove: RP/PT = SQ/QT

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