7th Grade Math Definitions Page 3
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4Circles
Circle: A set of points equal distance from a given point, called the center of the circle.
Diameter: A line segment that passes through the center of a circle, and whose endpoints lie on the circle.
Radius: A line segment whose endpoints are the center of a circle and any point on the circle.
Chord: A line segment whose endpoints are any two points on a circle.
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Geometric Solids
Polyhedron: A three dimensional closed figure with faces that are polygons.
Face: A flat surface of a polyhedron.
Edge: A line segment at which two faces of a polyhedron intersect.
Vertices: Are the corner points of a solid figure.
Prism: A polyhedron with at least two faces that are congruent and parallel.
Cube: A rectangular prism with six congruent square faces.
Pyramid: A polyhedron with a single base that is a polygon and faces that are triangles.
Cone: A 3-D figure with one circular base and one vertex.
Cylinder: A solid figure that has two circular bases. The bases are congruent and parallel.
Sphere: A 3-D figure. All of the points on the surface of the sphere are the same distance from the center.
Square Roots
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4
9
16
25
36
49
64
81
100
0
1
2
3
4
5
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8
9
10
121
144
169
196
225
256
289
324
361
400
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17
18
19
20
441
484
529
576
625
676
729
784
841
900
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30
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