a)2πr = 8π cm :π 2r = 8 |:2 r = 4 cm b)2πr = 21π cm |:π 2r = 21 |:2 r = 10,5 cm c)2πr = 120π cm |:π 2r = 120 |:2 r = 60 cm d)2πr = 0,82π cm |:π 2r = 0,82 |:2 r = 0,41 cm e)2πr = 6,28π m |:π 2r = 6,28 |:2 r = 3,14 f)2πr = π km |:π 2r = 1 |:2 r = 1/2
O = 2πr O = 2πr |:2π r = O/2π a) O = 8π r = 8π/2π r = 4 b) O = 21π r = 21π/2π r = 10,5 c) O = 120π r = 120π/2π r = 60 d) O = 0,82π r = 0,82π/2π r = 0,41 e) O = 6,28π r = 6,28π/2π r = 3,14 f) O = π r = 1π/2π r = 0,5
a)8π cm Wzór na dł. okręgu l=2πr 8π=2πr /:2π r=4 cm b)21π cm 21π=2πr /:2π r=10,5 cm c)120π cm 120π=2πr /:2π r=60 cm d)0,82π cm 0,82π=2πr /:2π r=0,42 cm e)6,28π m 6,28π=2πr/:2π r=3,14 m f)π km π=2πr/:2π r=0,5 km
