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d = ?
l = 2πr
2πr = 36πcm /:2
πr =18πcm /: π
r = 18cm
d=2r
d = 2 x 18
d = 36cm
l=36πcm
2πr=36πcm /:2π
r=36πcm:2π
r=18cm
średnica = 2r = 18cm × 2 = 36cm
obw = 2 * π * r
36 π cm = 2 * π * r
r = 36 π cm : 2
r = 18 cm
d = 2 * r
d = 2 * 18 cm
d = 36 cm