The height of the trapezoidal bed is $\"\"$ .

The bases of the trapezoidal bed are $\"\"$ and $\"\"$ .

Area of the trapezoidal is $\"\"$ .

Find the area of the trapezoidal.

Substitute $\"\"$ , $\"\"$ and $\"\"$ .

$\"\"$

$\"\"$ .

Therefore, the area of the trapezoidal is $\"\"$ .