Odpowiedzi

2009-12-08T13:12:41+01:00
P=πr² L=2πr

a) r= 2
P=π*2*2=4π
L=2*π*2=4π

b)r=₁/³
P=π*₁/³*₁/³= ₁/⁹π
L=2*π*₁/³=₁/⁶π

c)r=√5
P=π*√5*√5=5π
L=2*π*√5= 2√5π

d)r=2π
P=π*2π*2π=4π³

_________________________________________________________________

a) sr.= 6
r= 6/2=3
P=π*3*3=9π
L=2*π*6=6π
b)sr.= 1
r=0,5
P=π*0,5*0,5=0,25π
L=2*π*0,5=π
c)sr.= √2
r=√²/₂
P=π*√²/₂*√²/₂=₁/²π
L=2*π*√²/₂=2√2/₂=√2
d)sr.=π
r=π/₂
P=π*¹/₂π*₁/²π=π*₁/⁴π=₁/⁴π²
24 4 24