zad.1 Oblicz ile w przyblizeniu wynosi pole kola
a) o promieniu 3cm
b) o promieniu 0,2m
c) o srednicy 20cm
d) o srednicy 2,2m
zad.2 1. Ustal jakie pole ma kolo o promieniu:
7
3/5
0,4
1,2
1/2 pi
√6
5√2
2. Oblicz jakie pole ma kolo o srednicy:
8
5
2/3
2pi
4√3
√5
2/7√2 3.
Ustal jaki promien ma kolo o polu
pi
1/16 pi
1,21 pi
1/5 pi
4
5
9/pi
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ll = PI
Zad. 1
r=3cm
P=IIr2
P=Il3 2 = 9ll = 9x3,14=28,26cm2
b) 0,2m=20cm
r=20cm
P=llr2
P=ll20 2= 400ll=400x3,14=1256cm2=0,1256m2
c)d=20
r=20:2=10
r=10
P=llr2
P=ll10 2 = 100ll = 100x3,14 = 314 cm2
d) d=2,2m
r=1,1m
P=llr2
P=ll1,1 2= 1,21ll = 1,21x3,14 = 3,79 m2