###### Exercise57

A trapezoid’s area can be calculated by the formula $$A=\frac{1}{2}(b_1+b_2)h\text{,}$$ where $$A$$ stands for area, $$b_1$$ for the first base’s length, $$b_2$$ for the second base’s length, and $$h$$ for height.

Use the formulas to calculate the trapezoid’s area. Its first base’s length is $${13\ {\rm m}}\text{,}$$ its second base’s length is $${10\ {\rm m}}$$ and its height is $${9\ {\rm m}}\text{.}$$

Area =

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