## Glossary of Geometry Unit One 4th grade UCSMP

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- A polygon with six sides.
- Hexagon

- angle
- A figure that is formed by two rays or two line segments with a common endpoint.

- Circle
- the set of all points in a plane that are the same distance from a given oint known as the center.

- Circumference
- The distance around a circle or sphere (perimeter of a circle)

- concave polygon
- a polygon in which at least on vertex is "pushed in"

- Concentric circles
- circles that have the same center but different radii.

- congruent
- having the same shape and size

- convex polygons
- a polygon in which all verticies are pushed outward

- diameter
- a line segment that passes through the center of a circle or sphere and has endpoints on the circle or sphere.

- endpoint
- A point at the end of a line segment or ray

- equilateral triangle
- a triangle with all angles and sides equal.

- hexagon
- a polygon with six sides

- intersect
- to meet or cross

- kite
- a quadrilateral with two pairs of adjacent equal sides. The four sides cannot have the same length

- line segemnt
- a straight path joining two points called endpoints.

- nonagon
- apolygon with nine sides

- octagon
- apolygon with eight sides

- Parallel
- never meeting and always the same distance apart

- parallelogram
- a quadrilateral with two pairs of parallel sides that are congruent.

- pentagon
- a five-sided polygon

- perimeter
- the distance around the outside of a 2-d shape.

- perpendicular
- meeting at right angles

- point
- an exact location in space

- polygon
- a closed 2-d figure that is made up of line segments and has one inside and one outside

- quadrangle or quadrilateral
- a polygon that has four sides

- radius
- a line segemnt from the center of the circleto any point on the circle. Half the diameter

- ray
- a straight path that extends infinitely from one endpoint

- rectangle
- a quadrilateral with right angles

- regular polygon
- a polygon in which all angles and sides are equal

- rhombus
- a quadrilateral whose sides are all the same length

- a right triangle
- a triangle with a right angle

- square
- arectangle with all congruent sides

- trapezoid
- a quadrilateral with only one pair of parallel sides

- triangle
- a polygon with three sides

- vertex
- the point where the rays of an angle meet