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The expression $\frac{1}{2} b h$ gives the area of a triangle where $b$ is the base of the triangle and $h$ is the height of the triangle.$\newline$What is the area of a triangle with a base of $7 \mathrm{~cm}$ and a height of $4 \mathrm{~cm}$ ?$\newline$$$\mathrm{cm}^{2}$$