Polygon Angles
For any polygon of n sides:
Four Circle Formulas
Circumference = 2πr = πd
Parallelogram:
Area of Parallelogram = base × height
2.
Rectangle:
Perimeter of Rectangle = 2(length + width)
Area of Rectangle = length × width
3.
Rhombus: Four equal sides.
Perimeter of Rhombus = 4 × side
Area of Rhombus = base × height
4.
Square: Four right angles and four equal sides.
Perimeter of Square = 4 × side
Area of Square = (side)^2
5.
Sum of Interior Angles = (n − 2) × 180°
Sum of Exterior Angles = 360°