Oblicz pola powierzchni walców przedstawionych na rysunku.
A) Pc= 2r(r+H)= 2 *4(4+8)= 8 *12= 96
B)Pc=2 * 10(10+10)= 20 * 20=400
C) a=5 (X TO 2)
a=5
d=5 -> r=2,5
H=5
Pc= 2 * 2,5 (2,5+5)= 5 * 7,5=37,5
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A) Pc= 2r(r+H)= 2 *4(4+8)= 8 *12= 96
B)Pc=2 * 10(10+10)= 20 * 20=400
C) a=5 (X TO 2)
a=5
d=5 -> r=2,5
H=5
Pc= 2 * 2,5 (2,5+5)= 5 * 7,5=37,5