Lines
lines in the same plane that never intersect
what is parallel
an angle that measures less than 90 degrees
what is acute
a flat surface that has no thinkness and extends forever
what is a plane
This polygon has four congruent sides and four congruent angles
What is a square
two angles whose measures add to 180 degrees
what are supplementary
a line that intersects two or more lines
what is transversal
the three angles of a triangle always add to this
what is 180 degrees
part of a line that has one endpoint and extends forever in one direction
what is a ray
This polygon has five sides
What is a pentagon
figures that have the same shape but could be different sizes
what is similar
lines that do not intersect and are also not parallel
what is skew
a triangle with one angle measuring 90 degrees
what is a right triangle
an exact location usually represented as a dot
what is a point
This polygon has eight sides
What is an octagon
an angle that measures 180 degrees
what is straight
when lines intersect to form a 90 degree angle
what is perpendicular
an angle that measures more than 90 degrees
what is obtuse
figures that have the same shape and size
what is congruent
This polygon has six sides
What is a hexagon
two angles whose measures add to 90 degrees
what are complementary
a set of tick marks on line segments in a figure means this
the lines are congruent
a triangle with two congruent sides
what is isosceles
part of a line or ray with two endpoints
what is a line
This polygon has four sides
What is a quadrilateral
the distance around a polygon
what is perimeter