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a) K = s + s + s + s
= 6 + 6 + 5 + 5
= 22 cm
b) Luas = alas x tinggi = 6 cm x 4 cm = 24 cm
= (6+5)×2
= 11×2
= 22 cm²
L = a×t
= 6×4
= 24 cm²