Use the Pythagorean Theorem and the square root property to solve Exercises 139–143. Express answers in simplified radical form. Then find a decimal approximation to the nearest tenth.

A rectangular park is 6 miles long and 3 miles wide. How long is a pedestrian route that runs diagonally across the park?

Pythagorean Theorem

Square root property

The Pythagorean Theorem The sum of the squares of the lengths of the legs of a right triangle equals the square of the length of the hypotenuse. If the legs have lengths a and b, and the hypotenuse has length c, then a + b = c. Hypotenuse A b Leg B a Leg C