How do I altitude of an isosceles triangle with base 16 and congruent sides of length 9

Question

How do I altitude of an isosceles triangle with a base 16 and congruent sides of length 9

Answer 1

How do I altitude??

You mean how do I find the altitude.

Draw the isosceles triangle and its altitude to the base. This forms two right triangles, congruent, each triangle having one leg equal to 8 and hypotenuse 9. Now use the wonderful Pythagorean Theorem to find the other leg, which is the altitude.