Oblicz pole całkowite bryły powstałej z:
a) Obrotu kwadratu o boku 5cm do okola jednego z boków
b) Obrotu prostokąta o bokach 4cm i 8cm do okola z krotszego z bokow
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a)
a=5cm
r=5cm
H=5cm
Pc=2Pp+Pb
Pc=2*pir^2+2pir*h
h=r
Pc=4pir^2
Pc=4*5^2pi=4*25pi
Pc=100picm^2
b)
H=4cm
r=8cm
Pc=2pir^2+2pirh
Pc=2*8^2pi+2*4*8pi=2*64pi+64pi=128pi+64pi
Pc=192picm^2.