Question 1033713
.
C = 13

B = 12

What does A =?
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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^2 + B^2}}} = {{{C^2}}},   or

A = {{{sqrt(C^2 - B^2)}}}.

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

A = {{{sqrt(13^2 - 12^2)}}} = {{{sqrt(169 - 144)}}} = {{{sqrt(25)}}} = 5.

<U>Answer</U>.  A = 5.  //  A does 5.
</pre>

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:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/Pythagorean-theorem/The-Pythagorean-Theorem.lesson>The Pythagorean Theorem</A>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/Pythagorean-theorem/More-proofs-of-the-Pythagorean-Theorem.lesson>More proofs of the Pythagorean Theorem</A>
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