The land in the Catskill Mountains is heavily wooded. In the summer time, the lavish leaves on the tall trees keep the sunlight from reaching to the ground. There is a circular open space in a slightl......

We need to make a bridge to connect the two sides of a canal. The canal is 5 meters wide and 2 meters deep. The villagers constructed this canal as part of the effort to control the flood. The retaini......