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d = 2,8 m
maka
Luas = 1/4 x 3,14 x d²
= 1/4 x 3,14 x 2,8²
= 1/4 x 3,14 x 7,84
= 6,1544 cm²
luas lingkaran
= πr²
= 22/7 x 1,4²
= 22/7 x 1,96
= 6,16m²