Răspuns :
lungimea cercului este 2 pi r
a) diam=10 cm=> r=5
lung cerc=2*5 pi
lung cerc=10 pi
b) 6 intr si 2/5=6*5+2/5=32/5
lung cerc= 2*32/5 pi
lung cerc=64/5 pi
a) diam=10 cm=> r=5
lung cerc=2*5 pi
lung cerc=10 pi
b) 6 intr si 2/5=6*5+2/5=32/5
lung cerc= 2*32/5 pi
lung cerc=64/5 pi
a).L=2[tex] \pi [/tex]R=2[tex] \pi [/tex]·5=10[tex] \pi [/tex].
b).L=2[tex] \pi [/tex]R=2·6 2/5[tex] \pi [/tex]
2·32/5[tex] \pi [/tex]=64/5[tex] \pi [/tex]
b).L=2[tex] \pi [/tex]R=2·6 2/5[tex] \pi [/tex]
2·32/5[tex] \pi [/tex]=64/5[tex] \pi [/tex]