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luas 7/10 lingkaran = 7/10 πr²
= 7/10 . 3,14 . 50²
= 7/10 . 3,14 . 2500
= 7 . 3,14 . 250
= 5495 cm²
r = 50 cm
maka :
L 1 lingkaran = π x r²
= 3,14 x 50²
= 7.850 cm²
jadi luas 7/10 = 7/10 x 7850
= 5.495 cm²