### Home > CALC > Chapter Ch12 > Lesson 12.2.2 > Problem 12-80

12-80.

Draw a diagram where the *d* = distance from the dock, which is the height of an isosceles triangle.

Let *x* = distance the owner has walked.

When the owner has walked 10 ft, by the Pythagorean Theorem, *d* = √ 175 .

Substitute in the known values and solve for *d′*.