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We basically have this triangle set up:
Since we can see that the triangle has legs of 12 and x with a hypotenuse of 24, we can use Pythagoreans theorem to find the unknown side.
where a and b are the legs of the triangle and c is the hypotenuse
Plug in a=12, b=x, and c=24. Now lets solve for x
Square each individual term
Subtract 144 from both sides
Combine like terms
Take the square root of both sides
Simplify the square root
Which approximates to...
So our answer is