The bottom radius of the cylinder is 2.5 meters and the height is 20 meters.

Film area = half of cylinder side area+bottom circle area.

=( 1/2)*2*3. 14*2.5*20+3. 14*2.5*2.5

=3. 14*(50+6.25)

= 176.625 m2

The space in the greenhouse is half the volume of the cylinder;

(1/2) * 3.14 * 2.5 * 2.5 * 20 =196.25m3.