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r=5,7cm
V=4/3πr³
V=4/3π*5,7³
V=4/3π*185,193
V=4π*61,731
V=246,924 π
80%**246,924π=0,8*246,924 π=197,5392*3,14≈620 cm³
odpowiedź A.
4. 20*2+100*0,56=p*2,56 => 40+56=p*2,56
p=96/2,56=37,5%
odpowiedź D.
r=6cm
V=4/3πr³
V=4/3π*6³
V=4/3π*216
V=4π*72V=288 π
80%**288 π=0,8*288 π=230,4*3,14≈723,5 cm³