# Lumos StepUp - SBAC Online Practice and Assessments - Grade 11 Mathematics Use coordinates to compute perimeters of polygons

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## Point R is the midpoint of $$\overline{JK}$$ and $$\overline{AB}$$. The coordinates of J, K, and A are J(-4, 5), K(6, -5), A(2, 8). What are the coordinates of point B?

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