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AREA Formula CIRCUMFERENCE (Perimeter) Formula Circle A = r. C = d or C = 2r POLYGON AREA Formula 1 AREA Formula 2 Square A = s. A = ½ d Rhombus A = bh. A = ½ dd Parallelogram A = bh. Rectangle ... Find the area of the triangle whose vertices are (-9, 8), (-9, 16), and (-17, 8) ... ................
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