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# Geo Vocab

### Geometry Vocaulary

TermDefinition
line a set of points that continue in both directions without end
line segment part of a line with two endpoints
ray part of a line that has one endpoint and continues in the other direction without end
point an exact location in space; has no size
parallel lines lines that never intersect
intersecting lines lines that cross
perpendicular lines lines that intersect at 90 degree angles
angle 2 rays with a common endpoint
acute angle an angle that is less than 90 degrees
right angle an angle that is exactly 90 degrees
straight angle an angle that measures 180 degrees
360 degrees the number of degrees in a circle
obtuse angle an angle that measures greater than 90 degrees but less than 180 degrees
circle a set of points that are equidistant (the same distance) from a common point called the center; named by its center point
chord a line segment in a circle with both endpoints on the circle
diameter a line segment in the circle with both endpoints on the circle, and it passes through the center
radius (radii - plural) a line segment in a circle with one endpoint on the circle and one endpoint on the center (1/2 the diameter)
polygon a closed figure made of line segments that do not intersect
triangle three-sided polygon
obtuse triangle triangle with 1 obtuse angles and 2 acute angles
acute triangle triangle with 3 acute angles
right triangle triangle with 1 right angle and 2 acute angles
equilateral triangle triangle with 3 congruent sides
congruent exact same size and shape
scalene triangle triangle with no congruent sides
isosceles triangle triangle with at least 2 congruent sides