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2nr = kliling
2 x 22/7 x r = 132
r = 132 x 7/44
r= 21
luas = n r² = 22/7 x 21² =1.386 cm²
keliling = 2 x pi x r,
1,32 = 2 x 3,14 x r,
r = 0,21.
luas roda = pi x r pangkat 2 = 1/2 x 3,14 x 0,21 x 0,21 = 0, 138 m