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K = 2,2 m = 220 cm
K = . d
220 = 22/7 . d
220 . 7 / 22 = d
70 = d
jadi r = 35
L= r²
22/7 . 35. 35
3850 cm²
22.000 cm= Keliling x 100
Keliling = Jarak : banyak putaran
= 220 cm
Pertama,cari jari-jari nya dulu
K= pi d
220= 22/7 d
d= 220 : 22/7
= 70 cm
r = 35 cm
Luas roda tersebut= pi r² = 22/7 x 35 x35 = 3850 cm ²