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= √(144 + 72√2 + 18 + 144 - 72√2 + 18)
= √324
= 18 cm
Luas = p x l
= (12 + 3√2)(12 - 3√2)
= 144 - 18
= 126 cm²
diagonal = √ (12 + 3√2)² + (12 - 3√2)²
= √ (144 + 72√2 + 18 + 144 - 72√2 + 18)
= √324 = 18 cm
L = p x l
= (12 + 3√2) x (12 - 3√2)
= 144 - 36√2 + 36√2 - 18
= 126 cm²