Question | Answer |
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 |