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d² = 10² + 10²
d² = 100 + 100
d² = 200
d = √200
d = 10√2 cm
Caranya :
diagonal² = s² + s²
diagonal² = 10² + 10²
diagonal² = 100 + 100
diagonal² = 200
diagonal = √200
diagonal = √100x2
diagonal = 10√2