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Rumus : pi*jari-jari^2
3.14*100=314
Keliling
Rumus: pi*diameter
3.14*20=62.8
keliling = 3,14 x 20
keliling = 62,8 cm
luas = phi x r²
luas = 3,14 x (20:2)²
luas = 3,14 x 10²
luas = 3,14 x 100
luas = 314 cm²