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Lines & Angles

Review Vocabulary terms for Lines & Angles

QuestionAnswer
a one dimensional figure that extends forever in both directions line
part of a line, with two endpoints segment
a point at the end of a line segment or ray endpoint
a part of a line that has one endpoint and extends forever in the other direction ray
to cross through the same point intersect
two lines that cross (intersect) at right angles perpendicular
two lines, segments, or rays that do not cross, no matter how far they extend; they are equidistant from each other at all points parallel
two lines that are not parallel and will never intersect; they are on different planes skew
two rays with the same endpoint angle
each of the rays forming an angle side
the common endpoint of two rays forming an angle vertex
a unit of angle measure ( 1/360 of a complete circle), represented with (°) degree
a tool that measures angles protractor
an angle that measures 90°, it forms a perfect corner right angle
an angle smaller than a right angle; measures less than 90 degrees acute angle
an angle greater than a right angle but smaller than a straight angle (between 90° and 180°) obtuse angle
an angle formed by two rays pointing in opposite directions (180° angle) straight angle
two angles whose measures add up to 90°; they make a Corner complementary angles
two angles whose measures add up to 180°; they make a Straight line supplementary angles
angles with the exact same measure congruent angles
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