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Geometry Terms
Geometry Terms
20
Mathematics
3rd Grade
01/07/2007

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Term
base
Definition
a name used for a side of a polygon and a face of a three dimensional figure
Term
cone
Definition
a solid that has a circular base and a curved surface that ends at a point called the apex
Term
congruent figures
Definition
figures that have the same shape and size
Term
cylinder
Definition
a solid that has two circular bases that are parellel and the same size. The bases are connected by a curved surface. A can and a paper towel roll oare examples
Term
edge
Definition
a line segment or curve where the surfaces of a solid meet
Term
endpoint
Definition
the point at the end of a ray or line segment
Term
geometric solids
Definition
three dimensional shapes such as prisms, pyramids, cylinders, cones, and spheres
Term
line segment
Definition
a straight path between two endpoints
Term
parallel
Definition
always the same distance apart and never meeting or crossing each other no matter how far extended
Term
parallelogram
Definition
a four-sided polygon that has two pairs of parallel sides. The parallel sides are also the same length.
Term
polygon
Definition
a closed figure on a flat surface that is made up of line segments joined end to end. The line segments may not cross
Term
polyhedron
Definition
a geometric solid whose surfaces or faces are all formed by polygons
Term
prism
Definition
a solid that has two parallel bases that are polygons with the same size and shape. The other faces are parallelograms. They are often rectangles. They get their names from their bases.
Term
pyramid
Definition
a solid that has one base that is a polygon. All of the other sides or faces are triangles that come together at a point called the vertex, or apex.
Term
quadrangle
Definition
a polygon that has four sides and four angles. (Same as a quadrilateral.)
Term
ray
Definition
a straight path that has one endpoint and goes on forever
Term
rhombus
Definition
a parallelogram with all four sides the same length
Term
right angle
Definition
a 90 degree angle whose sides form a square corner
Term
trapezoid
Definition
a four sided polygon with exactly one pair of parallel sides
Term
angle
Definition
a figure that is formed by two rays or two line segments that have the same endpoint
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