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16. sisi = akar dari (8^2 + 6^2) = akar (64 + 36) = akar 100 = 10
kll = 4 × sisi = 4 × 10 = 40 cm
C (40 cm)
17. Luas = 1/2 × d1 × d2
144 = 1/2 × 12 × d2
144 = 6 × d2
d2 = 144/6
d2 = 24 cm
A (24 cm)
18. D (sudutnya sama)