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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
p = 10 + 2√5 cm
l = 8 - √5 cm
diagonal
= √(p² + l²)
= √((10+2√5)² + (8-√5)²)
= √(100 + 40√5 + 20 + 64 - 16√5 + 5)
= √(189 + 24√5) cm
luas persegi panjang
= p × l
= (10 + 2√5)(8 - √5)
= 80 + 16√5 - 10√5 - 10
= 70 + 6√5 cm²