### 2 Answers

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- billrussell42Lv 71 month ago
If it's a square, all the sides are equal.

plot the points. the length of AB is √(4²+2²) = √20 = 2√5

using x,y coordinates, the eq of the line thru AB has a slope of –2/4 = –1/2

slope of AD and BC would be +2, so draw lines with that slope and length from A and B

and C is 4,–3 or 4–3i

D is 0,–1 or 0–i

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