Lines
Two lines that are the same distance apart and will never touch
Parallel lines
This is the term for a 90 degree angle
Right angle
A triangle that has all sides the same length
Equilateral
This is the number of sides on a quadrilateral
4
A shape that has 6 sides is called
Hexagon
Lines that intersect to form a right angle
Perpendicular
An angle that is less than 90 degrees
Acute
A triangle with two sides the same length
Isosceles
This is the number of degrees all angles of a quadrilateral will add up to
360 degrees
A shape with 5 sides is called
Pentagon
This has one endpoint and continues in one direction forever
Ray
An angle that is greater than 90 degrees
Obtuse
A triangle with one angle greater than 90 degrees
Obtuse triangle
This is a quadrilateral with two pairs of opposite sides parallel and 4 right angles
Rectangle or Square
A right triangle has one angle that is 45 degrees. What is the measure of the 3rd angle
45 degrees
This is part of a line
Line segment
This is the number of degrees in a straight angle
180 degrees
This is a quadrilateral with two pairs of opposite sides parallel and all sides the same length. (it does not have to have right angles)
Rhombus
A triangle with no sides equal
Scalene triangle
This is a closed figure with at least 3 sides.
Polygon
This is used to measure angles
Protractor
All angles in every triangle will add up to this number of degrees
180 degrees
A figure with 10 sides is called
Decagon
A figure with 8 sides is called
Octagon