### Home > CALC > Chapter 7 > Lesson 7.1.2 > Problem 7-21

7-21.

Patrick, who is 6 feet tall, is walking way from a 10-foot tall lamppost. If he casts a shadow that is 12.5 ft long, how far from the lamppost is he? Homework Help ✎

Do you see two similar overlapping triangles? Recall that similar triangles have proportional sides. Set up a proportion and solve for *x*.