# Geometry Unit One 4th grade UCSMP

## Terms

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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