Geometry is useful in many everyday life situations. For example, when a person walks up or down a flight of stairs, geometry takes part. Each step is set at a ninety degree perpendicular angle to the ground. Carpenters use geometry all the time when putting together a house. Houses must stand on a flat surface or they will topple over. Construction workers use geometry when erecting walls that also have perpendicular sides. There is also a connection with geography. The planet Earth has odd shapes throughout in the form of rocks and ground surfaces. Geometry helps us to find out how to calculate the perimeters and surface areas of these shapes in order for roads, homes, buildings, and parks to be optimally designed for maximum space usage. Even when ships are travelling back, the captains can calculate how long it will take to get back to shore without the use of modern technology just by understanding the horizon, which is a horizontal line that can form an arc. Even modern satellites and the GPS use geometric principals to know the Earth’s rotational direction and how to find the coordinates on a plane. That is how anyone can be tracked since we are all on the planet and if we carry a GPS, then these coordinates correspond to the planet through a plane and through a sphere.