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# Unit 11

### Geometric Constructions

TermDefinition
angle A figure formed by two line segments or rays with a common endpoint.
vertex A common endpoint of two or more line segments or rays.
right angle An angle that measures exactly 90 degrees.
acute angle An angle that measures greater than zero degrees and less than 90 degrees.
obtuse angle An angle that measures greater than 90 degrees but less than 180 degrees.
straight angle An angle that measures exactly 180 degrees.
degree The measurement of an angle.
complementary angles Two angles whose measures have the sum of 90°
supplementary angles Two angles whose measures have the sum of 180°.
adjacent angles Angles that have a common vertex and a common side, but no common interior points.
parallel lines Lines in the same plane that never intersect and remain the same distance apart from each other.
intersecting lines Lines that have one or more points in common.
perpendicular lines Two lines that meet at a point and form right angles (90°) to each other.
vertical angles The opposite angles formed by two intersecting lines. Vertical angles have the same measure and therefore are congruent.
plane A flat, two-dimensional surface.
transversal A line that intersects two or more lines.
triangle A polygon with three sides and three angles.
triangulating Dividing a polygon into triangles without introducing any new vertices.
construct To form by assembling or combining parts; build.
side length The measure of a line segment forming part of the perimeter of a plane geometric figure.
protractor An instrument used to measure angles.
Created by: Mrs Ott