Shapes and Figures of Plane Geometry Summary

SHAPES AND FIGURES OF PLANE GEOMETRY Geometry Summary The important information in this chapter is summarized below. Shapes and Figures of Plane Geometry Summary Equilateral Triangle - all sides equal Isosceles Triangle - 2 equal sides and 2 equal angles Right 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 length Area of a triangle - A = (1/2)(base) (height) Perimeter of a triangle - P = side₁ + side₂ + side₃ Area of a parallelogram - A = (base) (height) Perimeter of a parallelogram - P = 2a + 2b where a and b are length of sides Area of a rectangle - A = (length) (width) Perimeter of a rectangle - P = 2(length) + 2(width) Area of a square - A = edge² Perimeter of a square - P = 4 x edge Area of a circle - A = pr² Circumference of a circle - C = 2pr MA-03 Page 12 Rev. 0