cylinder, radius=2, hite=20, want surfus area
side area=hite* serkel rim-leng=hite*2*pi*radius
=20*2*2*3.141592654...
=80*3.14159...
=251.3274...
##### area av 2 serkels at both ends=2*pi*radius^2
=2*2*2*3.14159
=8*3.14159
=25.132741...
251+25=bout 276