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# Topic 11 Part 1

### Two Dimensional Shapes and Their Attributes Lessons 1 and 2

TermDefinition
point An exact position, often marked by a dot.
line A set of points that forms an endless straight path in opposite directions.
line segment A part of a line with two endpoints.
intersecting lines Lines that cross at one point.
parallel lines Lines that never cross.
ray A part of a line with only one endpoint
angle Two rays with the same endpoint; that endpoint is the vertex of the angle.
vertex of an angle The endpoint of two rays that form an angle.
right angle An angle that makes a square corner.
perpendicular Two lines, line segments, or rays that make a right angle.
acute angle An angle that is open less than a right angle.
obtuse angle An angle that is open more than a right angle.