National Council of Teachers of Mathematics
The Math Forum: Drexel Math Forum: Distance to an Object
Dr. Math offers a way to calculate the altitude of a triangle using only the lengths of the sides of the triangle. He briefly explains how this was used by the Egyptians long ago.
National Council of Teachers of Mathematics
The Math Forum: Drexel Math Forum: Pythagorean Theorem
Dr. Math explains how to find distances indirectly by using the Pythagorean theorem.