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Geo Vocab
Geometry Vocaulary
Term | Definition |
---|---|
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 |
quadrilateral | four-sided polygon |
parallelogram | a quadrilateral with 2 pairs of parallel sides |
rhombus | a parallelogram with 4 congruent sides |
rectangle | a parallelogram with 4 right angles |
square | a parallelogram with 4 congruent sides and 4 right angles |
trapezoid | a quadrilateral with only one pair of parallel sides |