Chapter 5 vocabulary Flashcards
angle
a figure formed by two rays with a common endpoint called the vertex
right angle
an angle that measures at 90
acute angle
an angle that measures greater than 0 and less than 90
obtuse angle
an angle whose measure is greater than 90 but less than 180
complementary angles
two angles whose measures add to 90
supplementary angles
two angles whose measures have a sum of 180
adjacent angles
angles in the same plane that have a common vertex and a common side
vertical angles
a pair of opposite congruent angles formed by intersecting lines
congruent angles
angles that have the same measure
parallel lines
lines in a plane that do not intersect
perpendicular lines
lines that intersect to form right angles
corresponding angles
for two lines intersected by a transversal, a pair of angles that lie on the same side of the transversal and in the same sides of the other two lines
alternate interior angles
for two lines that intersected by a transversal, a pair of nonadjacent angles that lie on opposite sides of the transveral and between the other two lines
alternate exterior angles
for two lines intersected by a transveral, a pair of angles that lie on opposite sides of the transversal and outside the other two lines
triangle sum theorem
the theorem that states that the angle measures of a triangle add to 180
