2D Figure Formulas
Reguar Polygon
A "Regular Polygon" has: ** all sides equal and ** all angles equal.
Area of a Rectangle
Area of Rectangle =length x width
Area of a Triangle
Area of Triangle = base x height / 2 OR Area of Triangle = 1/2 (base * height)
Area of a Parallelogram
Area pf Parallellogram =base x height
Area of a Regular Polygon
Polygon Area= ap/2 a (apothem) = a line to the center of a side to the center of the polygon p (perimeter) = of sum of the side (s) of the polygon
Radius
measure across half of the circle Radius =D/2 or Radius=1/2 x D
Diameter
measure across the whole circle Diameter = 2 x radius or (D=2r)
Perimeter of a Polygon
perimeter = length of side x n (where "n" = the number of sides the polygon has). Perimeter = a+b+c+....... (add up all the sides)
Area
the amount of square units that can fit inside of a shape.
Perimeter
the distance around all of a shape
Circumference of Circle
π x diameter
Area of a Circle
π x radius^2 (radius squared)