=6.25*3. 14*2* 1/2

= 19.625*2* 1/2

=39.25* 1/2

= 19.625 m2

2.5*2*3. 14* 1/2* 12

=5*3. 14* 1/2* 12

= 15.7* 1/2* 12

=7.85* 12

=47. 1 m2

19.625+47. 1 ≈ 67m2

A: It takes about 67 square meters of plastic film.

(2)2.5*2.5*3. 14* 1/2* 12

=6.25*3. 14* 1/2* 12

= 19.625* 1/2* 12

=9.8 125* 12

=117.75m2.

A: The space in the shed is 1 17.75 square meters.