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d=28cm
r=d/2=14cm
h=40cm
Obliczenia:
V=πr²h
V=3,14×14²×40=3,14×196×40=24617,6cm³
1m³=1000l
24617,6cm³=24,6176l≈25l
Odp.: Kosz ma pojemność ok.25l.
d=2r |:2
28cm=2r |:2
r = 14cm
V=πr²h=3,14 x (14cm)² x 40cm = 3,14 x 196cm² x 40cm = 24617,6 cm³
1cm = 0,1 dm
1cm³ = 0,1dm x 0,1dm x 0,1 dm
1cm³ = 0,001 dm³
24617,6 cm³ = 24,6176 dm³
1dm³ = 1l
24,6176 dm³ ≈ 25 l