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=3,14 . 30² cm
=3,14 . 900 cm
=2,826 cm
luas lingkaran = phi .d²
=3,14 . 100² cm
=3,14 . 10.000 cm
=31,400 cm
maaf kalau salah ya
= 3,14 x 30 x 30
= 2826 cm²
Luas = phi x r²
= 3,14 x 50 x 50
= 7850 cm²