Oblicz pole i obwód koła,którego promień jest równy: a] 1cm b] trzy czwarte metra c] 2,2dm d] 5 i jedna trzecia cm
a)
b)
c)
d)
a) P= πr2
P= π12=1π cm2
l=2πr
l=2∙1π=2π cm
b) r=3/4 m
P=π (3/4)2= 9/16πcm2
l=2∙3/4π=1 1/2 πcm
c) r=2,2 dm
P=π 2,22=4,84πdm2
l= 2∙2,2π=4,4πdm
d) r= 5 1/3 cm
P=π (16/3)2 = 28 4/9 π cm 2
l=2∙5 1/3π=10 2/3π cm
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a)
b)
c)
d)
a) P= πr2
P= π12=1π cm2
l=2πr
l=2∙1π=2π cm
b) r=3/4 m
P=π (3/4)2= 9/16πcm2
l=2∙3/4π=1 1/2 πcm
c) r=2,2 dm
P=π 2,22=4,84πdm2
l= 2∙2,2π=4,4πdm
d) r= 5 1/3 cm
P=π (16/3)2 = 28 4/9 π cm 2
l=2∙5 1/3π=10 2/3π cm