Question

The angle of elevation of a ladder leaning against a wall is 45°. If the distance from the base of the ladder to the wall is 15 feet, find the length of the ladder.

Answer 1

Here is what you need to know, The triangle is a right isoceles as the angles must be
90, 45, and 45 degrees. Therefore you know the two sides are equal.

Use pythagorean theorem, you have the two sides at 15 ft. Calculate the hypotenuse which is the ladder.