2 years ago

12

Mathematics

1 answer:

Artemon [7]2 years ago

7 0

Answer:

Step-by-step explanation:

Use Pythagorean theorem,

base² + altitude² = hypotenuse²

a² + 9² = 12²

a² = 12² - 9²

a² = 144 - 81

a² = 63

a = √63

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