Unit 7 Angles, Triangles & Prisms
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33 Terms
ray
A part of a line, with one endpoint, that continues without end in one direction
angle
A figure formed by two rays with a common endpoint
vertex
A point where two or more straight lines meet.
acute angle
an angle that measures less than 90 degrees
right angle
an angle that measures 90 degrees
obtuse angle
An angle that measures more than 90 degrees but less than 180 degrees
straight angle
an angle that measures 180 degrees
complementary angles
Two angles whose sum is 90 degrees
supplementary angles
Two angles whose sum is 180 degrees
congruent
Having the same measure
Bisector
The line that divides something into two equal parts.
angle bisector
a ray that divides an angle into two congruent angles
parallel lines
lines in the same plane that never intersect
perpendicular lines
Lines that intersect to form right angles
Transversal Line
wa line that intersects two parallel lines
alternate interior angles
angles between 2 lines and on opposite sides of a transversal
corresponding angles
Angles in the same place on different lines
vertical angles
A pair of opposite congruent angles formed by intersecting lines
Midpoint
A point that divides a segment into two congruent segments
congruent segments
segments that have the same length
segment bisector
a segment, ray, line, or plane that intersects a segment at its midpoint
perpendicular bisector
a line perpendicular to a segment at the segment's midpoint
plane
flat surface
equilateral triangle
A triangle with three congruent sides
isosceles triangle
a triangle with two equal sides
scalene triangle
a triangle with no congruent sides
acute triangle
A triangle that contains only angles that are less than 90 degrees.
right triangle
a triangle with one right angle
obtuse triangle
a triangle with one obtuse angle
quadrilateral
a four-sided polygon
Parallelogram
A quadrilateral with two pairs of parallel sides
Rhombus
A parallelogram with four congruent sides
Trapezoid
A quadrilateral with exactly one pair of parallel sides
Note 
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