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AD = 6 cm
∠ADC = 180° - ∠DAB
= 180° - 65°
= 115°
2. L(persegi) = 8²
= 64 cm²
L(ps.panjang) = (1/2).L(persegi)
= (1/2).(64)
= 32 cm²
l = L/p
= 32/16
= 2 cm