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Answer:
a = √72
Step-by-step explanation:
Using Pythagoras' Theorem,
hypotenuse² = opposite² + adjacent²
9² = 3² + a²
a² = 9² - 3²
a² = (9-3)(9+3)
a² = 6(12)
a² = 72 Take square roots of both sides
a = √72