Undefined Terms and Angles

• Undefined terms- does not have a formal definition in geometry
• • Point - has no dimension. Represented by a dot
• • Line - has one dimension represented by a line with two arrows but it extends without end
• • Plane - has two dimensions. Represented by a shape that looks like a floor, but it extends without end
• Collinear Points: lie on the same line
• Coplanar Points: lie on the same plane
• Defined Terms- can be described using known words sum point or line.
• • Segment - consist of two endpoints on the line between those two points
• • Ray - consist of one endpoint and all the points in one on its line
• • Opposite rays - Rays beginning at the same endpoint, in opposite directions on the line