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Lsegitiga = (18.9√3)/2
= 81√3 cm²
Llingkaran = π.r²
= π.(18²)
= 324π cm²
L.arsir = Llingkaran - 6.(Lsegitiga)
= 324π - 6.(81√3)
= (324π - 486√3) cm²
≈ 175,58 cm²