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Section A.10 Areas
Area of a rectangle
\begin{align*}
A &= b h
\end{align*}
Area of a triangle
\begin{align*}
A &= \frac{1}{2} b h = \frac{1}{2} ab \sin \theta
\end{align*}
Area of a circle
\begin{align*}
A &= \pi r^2
\end{align*}
Area of an ellipse
\begin{align*}
A &= \pi ab
\end{align*}
