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r= ob/2pi
p=pi*r kwadrat
a)
49pi
b)
0,36 pi
b)
0.16pi
oczywiscie cm kwadratowych wszytstko
Ob=2πr
r=14π:2π
r=7
P=πr²
P=π7²
P=49πcm²
b) Ob=1,2π
r=1,2π:2π
r=0,6
P=π0,6²
P=0,36πcm²
c) Ob=0,8π
r = 0,8π:2π
r = 0,4
P=π0,4²
P=0,16πcm²
7=r
πr²=49π
1,2π=2πr/:2π
0,6=r
πr²=0,36π
0,8π=2πr/:2π
0,4=r
πr²=0,16π