2012 AMC 10B Problems/Problem 12
Point B is due east of point A. Point C is due north of point B. The distance between points A and C is , and . Point D is 20 meters due north of point C. The distance AD is between which two integers?
If point B is due east of point A and point C is due north of point B, is a right angle. And if , is a 45-45-90 triangle.