Oblicz długość okręgu którego średnica jest równa:
a)0,04 dm
b)2,5 m
d = 0,04 dm = 0,4 cm = 4mmr = 2mml = 2πr = 2 * 2mm * π = 4π mm = 12,56mmd = 2,5m r = 1,25ml = 2πr = 2 * 1,25m * π = 2.5π mm = 7,85π
4/100 dm = 4/10 cm = 4 mm
r - 2mm
L - dlugosc okregu
l=2r*Pi
l= 4mmPi
b) r - 1,25
l = 2r*Pi
l = 2,5Pi
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d = 0,04 dm = 0,4 cm = 4mm
r = 2mm
l = 2πr = 2 * 2mm * π = 4π mm = 12,56mm
d = 2,5m
r = 1,25m
l = 2πr = 2 * 1,25m * π = 2.5π mm = 7,85π
4/100 dm = 4/10 cm = 4 mm
r - 2mm
L - dlugosc okregu
l=2r*Pi
l= 4mmPi
b) r - 1,25
l = 2r*Pi
l = 2,5Pi