Michael J. answered • 07/12/17

Tutor

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Effective High School STEM Tutor & CUNY Math Peer Leader

Find the distance between point P and point Q.

" " distance between point Q and point R.

" " distance between point R and point S.

" " distance between point S and point P.

Then add those distances to get the perimeter. It is a square if the 4 distances are the same, and each pair of lines are perpendicular to each other. Perpendicular means the intersecting lines have negative reciprocal slopes.