# Geometry Terms 1

## Terms

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- an exact location
- point
- a straight path that extends without end in opposite directions
- line
- a flat surface that extends without end in all directions
- plane
- made up of two endpoints and all the points between the endpoints
- line segment
- has one endpoint. From the endpoint, it extends without end in one direction only
- ray
- measures less than 90 degrees
- acute angle
- measures 90 degrees
- right angle
- measures more than 90 degrees and less than 180 degrees
- obtuse angle
- two rays with a common endpoint
- vertex
- a triangle with all angles measuring less than 90 degrees
- acute triangle
- a triangle containing one obtuse angle
- obtuse triangle
- a triangle containing one right angle
- right triangle
- a triangle with no congruent sides
- scalene triangle
- a triangle with at least two congruent sides
- isosceles triangle
- a triangle with three congruent sides
- equalateral triangle
- a four sided polygon, or a plane with four sides and four angles
- quadrilateral
- a figure formed by two rays with a common endpoint called the vetex
- angle
- a quadrilateral with two pairs of parallel sides
- parallelogram
- a parallelogram with four right angles
- rectangle
- a parallelogram with all sides congruent
- rhombus
- an angle that measures 180 degrees
- straight angle
- a pair of opposite congruent angles formed by intersecting lines
- vertical angle
- two angles that are side by side and have a common vertex and ray
- adjacent angle
- two angles whose sum is 90 degrees
- complementary angles
- two angles whose sum is 180 degrees
- supplementary angles
- two lines that are opposite each other and never intersect
- parallel lines
- two lines that intersect to form a 90 degree angle
- perpendicular lines
- two lines on different planes and never intersect nor are they parallel
- skew lines
- a rectangle with four congruent sides
- square
- a quadrilateral with exactly one pair of parallel sides
- trapezoid
- a closed figure formed by three or more line segments that intersect only at their endpoints
- polygon