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p² = (10 + 2√5)²
= (10 + 2√5)(10 + 2√5)
= 100 + 40√5 + 20
= 120 + 40√5
l² = (8 - √5)²
= (8 - √5)(8 - √5)
= 64 - 16√5 + 5
= 69 - 16√5
panjang diagonal =