###### Exercise54

A triangle’s area can be calculated by the formula $$A=\frac{1}{2}bh\text{,}$$ where $$A$$ stands for area, $$b$$ for base and $$h$$ for height.

Find the triangle’s area if $$b={21\ {\rm ft}}$$ and $$h={10\ {\rm ft}}\text{.}$$

Area =

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