vocabulary
a location pictured by a dot and named by a letter
What is a point
an angle less than 90 degrees
What is an acute angle
lines that intersect at a 90 degree (right) angle
What are perpendicular lines
one angle is 40 degrees
What is 50 degrees
a line that goes forever in both directions
What is a line
two lines that never intersect
What are parallel lines
two angles that are opposite of each other
What are vertical angles
part of a line with 2 endpoints
What is a line segment
an angle that is exactly 90 degrees
What is a right angle
two angles with a sum of 90 degrees
What are complementary angles
lines that intersect and have exactly 1 point in common
What are intersecting lines
an angle that is exactly 180 degrees
What is a straight angle
the sides of an angle
What is a ray
an angle that is more than 90 and less than 180 degrees
What is an obtuse angle
two angles that are next to each other
What are adjacent angles