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2-D figures

Quadrilaterals, Polygons

Square 4 right angles 4 equal sides
Quadrilateral just 4 sides - no assumptions about angles or sides
Rhombus 4 equal sides
Rectangle 4 right angles
Parallelogram opposite sides parallel opposite sides congruent
Trapezoid exactly one pair of parallel sides
Sum of the angles of a quadrilateral 360
Pentagon 5 sides
Hexagon 6 sides
Heptagon 7 sides
Octagon 8 sides
Nonagon 9 sides
Decagon 10 sides
Sum of the measures of the angles of a polygon with n sides (n-2)180
Sum of the measures of the exterior angles of any polygon 360
Complementary angles add to 90
Supplementary angles add to 180
Vertical angles opposite; always congruent
Area of a parallelogram A = bh
Area of a triangle A = 1/2 bh
Area of a trapezoid A = 1/2 (b1+b2)h
Area of a circle A = π times the radius squared
Circumference of a circle C = πd or C = 2πr
Created by: nhartfield