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Topic 11 Grade 3

point an exact position often marked by a dot
line a straight path of points that goes on forever in both directions; Buzz Lightyear loves lines - "To infinity and beyond!"
line segment a part of a line that has 2 endpoints
intersecting lines lines that cross at one point
parallel lines lines that never cross or intersect
ray part of a line that has 1 endpoint and goes on forever in the other direction
angle a figure formed by 2 rays that have the same endpoint
vertex of an angle the common endpoint of 2 rays that form an angle
right angle an angle that forms a square corner or 90 degrees
perpendicular 2 lines, line segments, or rays that intersect to form right angles
acute angle an angle that measures less than a right angle or 90 degrees
obtuse angle an angle that measures more than a right angle or 90 degrees
polygon a closed plane figure made up of line segments
side a line segment forming part of a polygon
vertex of a polygon the point where 2 sides of a polygon meet
diagonal the line segment other than a side that connects 2 vertices of a polygon
triangle a polygon with 3 sides
Created by: pdeprosse