Right triangles have been important in surveying and construction since early civilization. Since then, special relationships in right triangles have led to improved navigation for ships and planes, to formulas for a pendulum and for distance, and to other areas of mathematics that use radical expressions.

In this chapter you will: learn to use the Pythagorean theorem learn about the basic trigonometric ratios learn to add and subtract radicals solve radical equations graph square root functions analyze real-world data using standard deviation