VOCABULARY acute angle an angle measuring less than 90°

angle two rays with a common endpoint

collinear on the same line

dimensons the measurements of an object (e. g., length, width, or height)

endpoint a point that marks the end of a line segment or ray

line an infinite set of points forming a straight path that continues in two directions

line segment a part of a line bounded by two endpoints

obtuse angle an angle measuring greater than 90°

plane a flat surface that continues in all directions

point a position in space

ray a part of a line that has one endpoint and continues in one direction

right angle an angle measuring 90°

straight angle an angle measuring 180°

vertex the point where two line segments, lines, or rays meet to form an angle