Vocabulary
Note:
Students will have a vocabulary packet with drawings for this unit
Acute angle: an angle measuring less than 90 degrees
Angle: two rays joined at a common endpoint; named by a point on one ray, then the common endpoint, then a point on the other ray
Intersecting: lines, line segments, or rays that meet or cross at one point
Line: a straight path that extends in both directions forever; it is named by two points on the line
Line of symmetry: an imaginary line that divides a shape into two identical halves that would perfectly match up if folded on the line
Line segment: a part of a line with two endpoints; it is named by the two endpoints
Obtuse angle: an angle measuring greater than 90 degrees and less than 180 degrees
Parallel: lines, line segments, or rays in a plane that stay the same distance apart and never meet or cross
Perpendicular: lines, line segments, or rays that meet or intersect to form right angles
Plane: a flat surface that extends without end in all directions
Point: a specific location in space
Ray: a part of a line with one endpoint that extends forever in one direction; named by the endpoint first and then another point on the ray
Right angle: an angle measuring exactly 90 degrees
Vertex: the common endpoint where two lines or rays meet; named with a capital letter
Acute angle: an angle measuring less than 90 degrees
Angle: two rays joined at a common endpoint; named by a point on one ray, then the common endpoint, then a point on the other ray
Intersecting: lines, line segments, or rays that meet or cross at one point
Line: a straight path that extends in both directions forever; it is named by two points on the line
Line of symmetry: an imaginary line that divides a shape into two identical halves that would perfectly match up if folded on the line
Line segment: a part of a line with two endpoints; it is named by the two endpoints
Obtuse angle: an angle measuring greater than 90 degrees and less than 180 degrees
Parallel: lines, line segments, or rays in a plane that stay the same distance apart and never meet or cross
Perpendicular: lines, line segments, or rays that meet or intersect to form right angles
Plane: a flat surface that extends without end in all directions
Point: a specific location in space
Ray: a part of a line with one endpoint that extends forever in one direction; named by the endpoint first and then another point on the ray
Right angle: an angle measuring exactly 90 degrees
Vertex: the common endpoint where two lines or rays meet; named with a capital letter