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h=V/πr²
h=785/3,14*5²=785/3,14*25=785/78,5=10cm
odp D
H = V/πr²
r = 10cm:2 = 5cm
H = 785cm³/(π*5cm*5cm)
H = 785cm³/(25cm²*π)
H = 31,4/π
H ≈ 31,4/3,14
H ≈ 10 [cm]
czyli odpowiedź D
r=5cm
H=?
V=pir2*H
785=pi*5(do kwadratu)*H
785=25pi*H
785=25*3,14*H
785=78,5H/:78,5
H=10
odp.D