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= Luas belah ketupat + Luas 4 setengah lingkaran
= (diagonal 1 × diagonal 2 : 2) + (4 × 1/2 × phi × r²)
= (16 × 12 : 2) + (4 × 1/2 × 3,14 × 5²)
= (96) + (157)
= 253 cm²