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luas = π x r x r = 3,14 x 17 x 17 = 907,46 cm²
keliling = 2 x π x r = 2 x 3,14 x 17 = 106,76 cm
= 2 x 17
= 34
luas = phi x r²
= 3,14 x 17 x 17
= 907,46cm²
kliling = 2 x phi x r
= 2 x 3,14 x 17
= 106,76cm
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