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Algebra 9 Online
OpenStudy (anonymous):

A triangle ABC with vertices A (6, 8), B (6, 12), and C (10, 12) is rotated 180º . What are the coordinates of B'?

OpenStudy (drigobri):

When you rotate 180º, the points change the sign (x, y) ~~> (-x, -y) So B (-6, -12) with 180º

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