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V=4/3πr³
P=4πr²
a)
r=3
V=4/3π*3³
V=4/3π*27
V=36π
P=4π*3²
P=4π*9
P=36π
b)
r=4√2
V=4/3π*(4√2)³
V=4/3π*128√2
V=512√2π/3
P=4π*(4√2)²
P=4π*32
P=128π
c)
r=12:2=6
V=4/3π*6³
V=4/3π*216
V=288π
P=4π*6²
P=4π*36
P=144π
d)
r=4√3:2=2√3
V=4/3π*(2√3)³
V=4/3π*24√3
V=32√3π
P=4π*(2√3)²
P=4π*12
P=48π
2.
a) 4πr²=100π cm²
r²=25 cm²
r=5 cm
b) 4πr²=1 m²
r²=1/(4π) m²
r=1/(2√π) m²
c) (4/3)πr³=288π cm³
r³= 216 cm³
r= 6 cm
d) (4/3)πr³= 36 dm³
r³= 27/π dm³
r=3/³√π dm