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Geometry is the study of two-dimensional shapes (circles, triangles), three-dimensional solids (spheres, cubes), and positions in space (points).

A horizontal is a line parallel to the earth’s surface, or horizon, going across rather than up and down. A vertical is a line that is straight up and down and perpendicular to the horizon.

A hypotenuse of a right triangle is the side opposite the right angle.

An intersection is the point where two lines in geometry cross each other.