How to find a area for a trapezoid?

To find the area of a trapezoid, use this formula:  $${\mathtt{A}} = {\mathtt{h}}{\mathtt{\,\times\,}}\left({\frac{\left({\mathtt{b1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{b2}}\right)}{{\mathtt{2}}}}\right)$$

H is the height of the trapezoid, and b₁ and b₂ are the lengths of the top and bottom bases.