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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:

The sum of the two bases is 15, the bigger base is 11 and the altitude is twice the smaller base.

Area=