#### Answer

$\frac{1}{2}$bh

#### Work Step by Step

The area, A, of a triangle with height h and base b is given by the formula $\frac{1}{2}$bh.
The area of a parallelogram is used to obtain a formula for the area of a triangle. The area of the parallelogram is A= bh. The diagonal in the parallelogram divides it into two triangles with the same size and shape. This means that the area of each triangle is one-half that of the parallelogram.