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use a coordinate proof to prove that the mid segment MN of pqr is parallel to PR and half the length of PR. What is the best first step?

use a coordinate proof to prove that the mid segment MN of pqr is parallel to PR and-example-1
User Gberth
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In order to make the process easier, it is convenient to place the triangle on a coordinate grid such that vertex P is at the origin and PR lies on the x axis:

use a coordinate proof to prove that the mid segment MN of pqr is parallel to PR and-example-1
User Zhubarb
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