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ZanzabumX [31]
2 years ago
15

12

Mathematics
1 answer:
Artemon [7]2 years ago
7 0

Answer:

63

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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