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Verified answer
Luas = 1/2 x alas x tinggi= 1/2 x (12+2√5) (12+2√5)
= 1/2 x (2(6+√5) (12+2√5)
= (6+√5) (12+2√5)
= 6(12) + 6(2√5) + 12√5 + √5(2√5)
= 72 + 24√5 + 10
= 82 + 24√5 cm²