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= × a × t
= × 9 × 12
= 9 × 6
= 54 cm²
= × a × t
= × 3,6 × 4,8
= 1,8 × 4,8
= 8,64 cm²
L = -
L = 54 - 8,64
L = 45,36 cm²
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K = Jumlah seluruh sisi
K = 9 + 7,2 + 3,6 + 9
K = 28,8 cm