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Mars2501 [29]
3 years ago
6

I'm horrible at this so can I please get help, the rest says "solve for a. a=

Mathematics
1 answer:
Inessa05 [86]3 years ago
8 0

Answer:

a = \sqrt{63}

Step-by-step explanation:

Using Pythagoras' identity in the right triangle.

The square on the hypotenuse is equal to the sum of the squares on the other 2 sides, that is

a² + 9² = 12²

a² + 81 = 144 ( subtract 81 from both sides )

a² = 63 ( take square root of both sides )

a = \sqrt{63}

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