$$A = \pi r^2 \quad | \quad C = 2\pi r \quad | \quad A = \ell w \quad | \quad A = \frac{1}{2}bh$$
$$c^2 = a^2 + b^2 \quad | \quad V = \ell wh \quad | \quad V = \pi r^2 h \quad | \quad V = \frac{4}{3}\pi r^3$$
Special Right Triangles: Side lengths of a $30^\circ-60^\circ-90^\circ$ triangle are in ratio $x, x\sqrt{3}, 2x$. For $45^\circ-45^\circ-90^\circ$, ratio is $x, x, x\sqrt{2}$.
The number of degrees of arc in a circle is $360^\circ$. The sum of measures in degrees of the angles of a triangle is $180^\circ$.
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