Okay, here we have this:
Considering the provided trapezoid, we are going to calculate the requested area, so we obtain the following:
To calculate the area requested then we will substitute in the following formula for the area of a trapezoid:
Area=(1/2)(Base 1+ Base2)(Height)
Replacing:
Area=(1/2)(6 cm+ 18 cm)(5 cm)
Area=(1/2)(24 cm)(5 cm)
Area=12 cm* 5cm
Area=60 cm^2
Finally we obtain that the area of trapezoid is 60 cm^2.