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geometry -beth
Chrysalis geometry vocabulary
Term | Definition |
---|---|
ray | a line that starts at a point and continues on forever |
Acute angle | Having fewer than 90 degrees |
Angle | Where two rays join |
arc | A continuous part of a circle; measured by the degrees formed by the two radii at the endpoints of the arc |
chord | A segment whose endpoints are on a circle |
circumference | Distance around a circle |
compass | Tool used to draw circles and arcs |
concave | In a polygon, a vertex is a point inside the polygon |
congruent | Shapes having the exact shape and size |
convex | None of the vertices in a polygon are contained inside the polygon |
coordinates | Numbers that correspond to a point on a line or graph |
degree | Angle measure |
diagonal | Segment that connects two vertices, but is not a side of a polygon |
diameter | Chord that passes through the center point of a circle |
equilateral | All sides have the same length |
hexagon | Polygon with six sides |
isosceles | A triangle with two equal sides |
line segment | A line that has two endpoints |
obtuse angle | Having between 90 and 180 degrees |
parallel | Always the same distance apart |
pentagon | A polygon with five sides |
perpendicular | Intersecting lines forming right angles |
polygon | Closed, plane figure formed by line segments meeting at their endpoints |
protractor | A device for measuring degrees in angles |
quadrilateral | A polygon with four sides |
radius | A segment from the center point to a point onthe circle |
rectangle | A quadrilateral with four right angles |
rhombus | A parallelogram with four congruent sides |
right angle | Having exactly 90 degrees |
scalene triangle | A triangle with no congruent (equal) sides |
similar | Shapes having the exact shape, but a different size |
square | A quadrilateral with four right angles and four congruent sides |
symmetry | If you divide a shape in the middle, both sides are identical |
trapezoid | A quadrilateral with only one pair of parallel lines |
triangle | A polygon with 3 sides |
vertex | Common endpoint of two rays that form an angle |