Odpowiedź :
2pir(wzor na obwod)=12,56 //2
stad
a.
pi r = 6,28
r=6,28/pi
wzor na pole pir^2
stad
Pole=pi*(6,28/pi)^2
pi*(39,43/pi^2)
39,43pi+pi^3
b.
2pi r=18,84
pi r=9,42
r=9,42/pi
pir^2(pole)
pi*(9,42/pi)^2
pi*(88,73/pi^2)
88,73pi+pi^3
stad
a.
pi r = 6,28
r=6,28/pi
wzor na pole pir^2
stad
Pole=pi*(6,28/pi)^2
pi*(39,43/pi^2)
39,43pi+pi^3
b.
2pi r=18,84
pi r=9,42
r=9,42/pi
pir^2(pole)
pi*(9,42/pi)^2
pi*(88,73/pi^2)
88,73pi+pi^3
a) P= πr²
2π=l
l=12.56
r= 6.23
p=π * 6.23² = 38.8129πcm²
38.8129 * 3.14 = 121.872506cm² ~ 121.87cm²
b) l = 18.84
r = 9.42m
p= π * 9.42² = 88.7364πm²
88.7364 * 3.14 = 278.632296 ~ 278.63m²
2π=l
l=12.56
r= 6.23
p=π * 6.23² = 38.8129πcm²
38.8129 * 3.14 = 121.872506cm² ~ 121.87cm²
b) l = 18.84
r = 9.42m
p= π * 9.42² = 88.7364πm²
88.7364 * 3.14 = 278.632296 ~ 278.63m²
O=2πr
P=πr²
a)
12,56=2πr
r=6,28 / π
P=π(6,28 / π)²
P=39,43 / π²
P=39,43 / 9,85 ≈ 4cm
b)
18,84=2πr
r=9,42/π
P=π(9,42/π)²
P=9,42 / π²
P=9,42 / 9,85 ≈ 0,95 m
P=πr²
a)
12,56=2πr
r=6,28 / π
P=π(6,28 / π)²
P=39,43 / π²
P=39,43 / 9,85 ≈ 4cm
b)
18,84=2πr
r=9,42/π
P=π(9,42/π)²
P=9,42 / π²
P=9,42 / 9,85 ≈ 0,95 m