Oblicz obwód koła o polu :
a) 0,49 Pi cm2
b) 16/25 Pi dm2
c) 36 Pi km2
dam naj !!!
a) r=0,7 cm
Obw = 2 Pi r = 1,4 Pi cm
b) r= 4/5 dm
Obw = 8/5 Pi dm
c) r = 6 km
Obw = 12 Pi km
a) r2 = 0,49 r = 0,7Obw = 2PirObw = 2 * 0,7 *PiObw = 1,4Pi cmb) r2 = 16/25 r = 4/5Obw = 2PirObw = 2 * 4/5 * PiObw = 8/5 Pi = 1i3/5 Pi dmc) r2 = 36 r = 6Obw = 2PirObw = 2 * 6 * PiObw = 12Pi km
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a) r=0,7 cm
Obw = 2 Pi r = 1,4 Pi cm
b) r= 4/5 dm
Obw = 8/5 Pi dm
c) r = 6 km
Obw = 12 Pi km
a) r2 = 0,49
r = 0,7
Obw = 2Pir
Obw = 2 * 0,7 *Pi
Obw = 1,4Pi cm
b) r2 = 16/25
r = 4/5
Obw = 2Pir
Obw = 2 * 4/5 * Pi
Obw = 8/5 Pi = 1i3/5 Pi dm
c) r2 = 36
r = 6
Obw = 2Pir
Obw = 2 * 6 * Pi
Obw = 12Pi km