по теореме пифагора
< var > a^2+b^2=c^2 < /var ><var>a
2
+b
=c
</var>
< var > a=\sqrt{c^2-b^2}=\sqrt{13^2-12^2}=\sqrt{169-144}=\sqrt{25}=5 < /var ><var>a=
c
−b
=
13
−12
169−144
25
=5</var>
