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Penyelesaian :Misal ...
Diagonal belah ketupat AC = D. a
Diagonal yang belum diketahui = D. b
D. b belah ketupat
= ( 2 × Luas ) ÷ D. a
= ( 2 × 960 cm² ) ÷ 60 cm
= 1920 cm² ÷ 60
= 32 cm
Keliling belah ketupat
= 2 × ( D. a + D. b )
= 2 × ( 60 cm + 32 cm )
= 2 × 92 cm
= 184 cm
Opsi => C
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