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= √36 + 64
= √100
= 10 cm
b) La = 1/2 x d₁ x d₂
= 1/2 x 12 x 16
= 6 x 16
= 96 cm²
c) Lp = 2La + Ka x tp
= 2 x 96 + 4 x 10 x 18
= 192 + 40 x 18
= 192 + 720
= 912 cm²
Catatan :
6 dari 1/2 nya diagonal 1 yaitu 12 cm
8 dari 1/2 nya diagonal 2 yaitu 16 cm