SHAPES AND FIGURES OF PLANE GEOMETRYGeometrySummaryThe important information in this chapter is summarized below.Shapes and Figures of Plane Geometry SummaryEquilateral Triangle- all sides equalIsosceles Triangle - 2 equal sides and 2 equal anglesRight Triangle - 1 angle equal to 90°Acute Triangle - each angle less than 90°Obtuse Triangle - 1 angle greater than 90°Scalene Triangle - each side a different lengthArea of a triangle -A = (1/2)(base) (height)Perimeter of a triangle -P = side1+ side2+ side3Area of a parallelogram -A = (base) (height)Perimeter of a parallelogram -P = 2a + 2b where a and b arelength of sidesArea of a rectangle-A = (length) (width)Perimeter of a rectangle -P = 2(length) + 2(width)Area of a square-A = edge2Perimeter of a square -P = 4 x edgeArea of a circle-A = pr2Circumference of a circle-C = 2prMA-03 Page 12 Rev. 0
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