Lines
Lines that never touch each other are called..........
parallel lines
An angle whose measure is less than 90 degrees.
What is an acute angle?
these angles share a common vertex and are equal.
What are vertical angles?
a 3 sided closed figure
What is a triangle?
The sum of the interior angles of a triangle
What is 180 degrees?
lines that cross each other are called .....
intersecting lines
an angle whose measure is greater than 90 degrees
What is an obtuse angle?
when 2 parallel lines are cut by a transveral, these angles are in the same relative location and they are equal
What are corresponding angles?
a 7 sided closed figure
What is a heptagon?
The sum of the interior angles of a 4 sided figure
What is 36o degrees
Lines that intersect to form right angles are called ....
perpendicular lines
an angle whose measure is equal to 180 degrees
What is a straight angle?
when 2 parallel lines are cut by a transveral, these angles are outside the parallel lines and on opposite sides of the transversal and they are equal
What are alternative exterior angles?
a 6 sided closed figure
What is a hexagon?
The sum of the interior angles of a pentagon
What is 540 degrees.
A lines that intersects two other lines is called ....
transversal
A tool used to measure the degree of an angle
What is a protractor?
a five sided closed figure
What is a pentagon
The sum of the interior angles of a hexagon
What is 720 degrees?
A straight line which links two points without extending beyond them
a line segment
an angle whose measure is equal to 90 degrees
What is a right angle?
when 2 parallel lines are cut by a transveral, these angles are inside the parallel lines and on opposite sides of the transversal and they are equal
What are alternate interior angles?
a nine sided closed figure
What is a nonagon
The sum of the interior angles of an octagon
What is 1080 degrees?