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Trapezoid

A trapezoid is a quadrilateral with exactly one pair of parallel sides. The parallel sides are called bases. The nonparallel sides are called legs.

Area of a trapezoid

$Area=\frac{B+b}{2}\cdot\;h\;$ , where B and b are the lengths of the two bases and h is the height of the trapezoid

Find the area.

$Area=\frac{B+b}{2}\cdot\;h\;$
$Area=\frac{16+12}{2}\cdot\;5\;$
A=80 units²

Find the area of a trapezoid where:

B = 9 is 6 units greater than b and the altitude is 4.

Area=