### Home > CCA2 > Chapter 7 > Lesson 7.1.2 > Problem 7-21

A semi-circular tunnel is

**Semi circle, with rectangle inscribed, labeled as follows: top side, 22, right side, 24 with question mark. Line segment passing through the vertical center of rectangle, from base to top point on the semi circle, labeled 26.**

**Added to diagram, diagonal from center bottom, to top right vertex, of rectangle, creating right triangle, labeled as follows: horizontal leg, 11, vertical leg, approximately 23.56, hypotenuse, 26.**

If he drives down the center of the road, the height of the tunnel at the edge of the house is only approximately