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Geometry for Dummies
By: Chase CallawayBlock 4
Point
An undefined term in geometry, it names a location and has no size.
Line (Segment)
A segment of an undefined term in geometry, a line is a straight path that has no thickness and extends forever.
Plane
An undefined term in geometry, it has a flat surface that has no thickness and extends forever.
Angle
A figure formed by two rays with a common endpoint.
Perpendicular Lines
Lines that intersect at 90* angles
Parallel Lines
Lines in the same plane that do not intersect.
Triangle
A three-sided polygon.
Right Triangle
A triangle with one right angle.
Pentagon
A five-sided polygon.
Hexagon
A six-sided polygon.
Square
A quadrilateral with four congruent sides and four right angles.
Rectangle
A quadrilateral with four right angles.
Trapezoid
A quadrilateral with exactly one pair of parallel sides.
Parallelogram
A quadrilateral with two pairs of parallel sides.
Circle
The set of points in a plane that are a fixed distance from a given point called the center of a circle.
Cylinder
A 3-D figure with two parallel congruent circular bases and a curve lateral surface that connects the bases.
Sphere
The set of points in a space that are a fixed distance from a given point called the center of the sphere.
Parabola
A plane curve formed by the intersection of a right circular cone with a plane parallel to a generator of the cone; the set of points in a plane that are equidistant from a fixed line and a fixed point in the same plane or in a parallel plane.
Octagon
An eight-sided polygon.
Pyramids
A polyhedron formed by polygonal base and triangular lateral faces that meet at a common vertex.