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= 22/7 x 42
= 132 cm
luas = 22/7 x jari-jari²
= 22/7 x 21 x 21
= 66 x 21
= 1,386 cm²
maaf kalo ada kesalahan
= 21 cm
luas = pi × r x r
= 22/7 x 21 x 21
= 1.386 cm^2
keliling = pi x d
= 22/7 x 42
= 132 cm