Answer:
[tex]BM = 12\,cm[/tex]
Step-by-step explanation:
The height BM of the triangle can be determined by using the Pythagorean theorem:
[tex]BM = \sqrt{BC^{2}-\left(\frac{1}{2}\cdot AC \right)^{2}}[/tex]
[tex]BM = \sqrt{(13\,cm)^{2}-(5\,cm)^{2}}[/tex]
The height of the isosceles triangle is:
[tex]BM = 12\,cm[/tex]