Consider the figure below.
Use a coordinate proof to prove that midsegment $ M N $ of $ \triangle P Q R $ is parallel to $ P R $ and half the length of
PR. Which is the best first step?
A Place the triangle on a coordinate grid such that vertex $ P $ is at the origin and $ \overline{P R} $ lies on the $ x- $ axis.
Place the triangle on a coordinate grid such that vertex $ P $ is on the $ y $-axis and vertex $ R $ is on the $ x $-axis.
(C) Place the triangle on a coordinate grid such that vertex $ Q $ is at the origin.
(D) Place the triangle on a coordinate grid such that $ \overline{Q R} $ lies on the $ x $-axis and $ \overline{P Q} $ lies on the $ y $-axis.

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