Circle: A=$\pi r^2$; C=$2\pi r$
Rectangle: A=$\ell w$
Triangle: A=$\frac{1}{2}bh$
Sphere: V=$\frac{4}{3}\pi r^3$
Cone: V=$\frac{1}{3}\pi r^2 h$
Cylinder: V=$\pi r^2 h$
Rectangular Solid: V=$\ell wh$
Pyramid: V=$\frac{1}{3}\ell wh$
The number of degrees of arc in a circle is 360.
The number of radians of arc in a circle is $2\pi$.
The sum of the measures in degrees of the angles of a triangle is 180.