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Geometric Book
Chantiuna Meadows4-9-13
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AngleTwo rays sharing a common endpoint. Angles are typically measured in degrees or radians.
ConeA three dimensional figure with a single base tapering to an apex. The base can be any simple closed curve. Often the word cone refers to a right circular cone.
DiameterA line segment between two points on the circle or sphere which passes through the center. The word diameter is also refers to the length of this line segment.
HeptagonA polygon with seven sides. Some authors also use the name septagon instead of heptagon.
KiteA quadrilateral with two pairs of adjacent sides that are congruent. Note that the diagonals of a kite are perpendicular.
OvalAn egg-shaped curve. Note: An oval is not the same as an ellipse.
Parallelogram
A quadrilateral with two pairs of parallel sides.
Pentagon
A polygon with five sides.
PyramidA polyhedron with a polygonal base and lateral faces that taper to an apex. A pyramid with a triangular base is called a tetrahedron.
RectangleA box shape on a plane. Formally, a rectangle is a quadrilateral with four congruent angles (all 90°).
Radius A line segment between the center and a point on the circle or sphere. The word radius also refers to the length of this segment.
RayA part of a line starting at a particular point and extending infinitely in one direction.
Reflection
A transformation in which a geometric figure is reflected across a line, creating a mirror image. That line is called the axis of reflection.
Rhombus
A parallelogram with four congruent sides. Note that the diagonals of a rhombus are perpendicular (as is the case with all kites).
SimilarIdentical in shape, although not necessarily the same size.
SquareA rectangle with all four sides of equal length. Formally, a square is a quadrilateral with four congruent sides and four congruent angles (all 90°).
PolygonA closed plane figure for which all sides are line segments. The name of a polygon describes the number of sides. A polygon which has all sides mutually congruent and all angles mutually congruent is called a rectangle polygon.
TriangleA polygon with three sides.
