[tex] \bf \textit{area of a trapezoid}\\\\
A=\cfrac{h(a+b)}{2}~~
\begin{cases}
a, b=\stackrel{bases}{parallel~sides} \\
h=height\\[-0.5em]
\hrulefill\\
a=20\\
b=25\\
h=15
\end{cases}\implies A=\cfrac{15(20+25)}{2}
\\\\\\
A=\cfrac{15(45)}{2}\implies A=337.5 [/tex]
