The sum of the interior angles of a triangle is 180o. In an isosceles triangle two of the angles are the same, say x. The third angle is then 180o2x.
http://wiki.answers.com/Q/How+many+corners+does+a+...

Altitude of triangle is the shortest line segment between a vertex of a
http://www.chacha.com/question/whatisaltitudeof...

since the isosceles triangle has 2 of the same side lengths and angle measure, you can use this information to solve the problem. you got 52 because you made 15 the length of the
http://answers.yahoo.com/question/index?qid=201108...

/ 5x=180 x=36 72,72,36d triangle
http://answers.yahoo.com/question/index?qid=200905...
