## Glossary of Geometry Terms 1

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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