SOLUTION: C = 13 B = 12 What does A =?

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Question 1033713: C = 13
B = 12
What does A =?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Giving the full problem description will make giving help easy to do for you. If the legs are x and y, and the hypotenuse is h, then x%5E2%2By%5E2=h%5E2.

Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.
C = 13
B = 12
What does A =?
~~~~~~~~~~~~~~~~~~~~~~~~~` 

Since your question goes under the section "Pythagorean Theorem", 
I can conclude that your question is about a right-angled triangle.

Standard naming for the right-angled triangle sides is: A and B are the legs, and C is the hypotenuse.

And the Pythagorean Theorem says: A%5E2+%2B+B%5E2 = C%5E2,   or

A = sqrt%28C%5E2+-+B%5E2%29.

Now substitute your data, and you will learn what A does:

A = sqrt%2813%5E2+-+12%5E2%29 = sqrt%28169+-+144%29 = sqrt%2825%29 = 5.

Answer.  A = 5.  //  A does 5.

Had you formulate your question in more clear way, you'd got the clear answer faster.

My gift for you are these two lessons that talk about the Pythagorean theorem:
      The Pythagorean Theorem
      More proofs of the Pythagorean Theorem