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geometry -beth

Chrysalis geometry vocabulary

TermDefinition
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
Created by: bethdmorrison
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