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Geometry
Flash Cards
69
Mathematics
11th Grade
11/14/2007

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Cards

Term
Circle
Definition
A set of coplaner points that are equidistant from the center point.
Term
Obtuse Angle
Definition
An angle that is more than 90° but less than 180°.
Term
Parallelogram
Definition
A shape with two sets of parallel sides and at least two sets of same sized angles.
Term
Convex Polygon
Definition
A polygon that you can't draw outside verticals but can draw inside vertical cards on.
Term
Corresponding Angles
Definition
Angles in the same area when a transversal crosses two lines.
Term
Centroid of a Circle
Definition
Created with the intersection of the altitudes of a triangle.
Term
Concave Polygon
Definition
A polygon you can draw both outside and inside verticals on.
Term
Polygon
Definition
Closed plane figure formed by connecting line segments endpoint to endpoint.
Term
Ray
Definition
Part of a line with only one endpoint. Goes on forever from that point.
Term
Kite
Definition
A four sided polygon with two sides that are larger than the other.
Term
Line
Definition
Length, no width
Term
Exterior Angle of a Polygon
Definition
A ray that creates a linear pair with an interior angle.
Term
Sphere
Definition
A set of all points equidistant around a given point.
Term
Equilateral Polygon
Definition
Shapes that have the same sized sides but can have different sized angles.
Term
Trapazoid
Definition
A four sided polygon with only one set of parallel sides.
Term
Parallel of a Polygon
Definition
A line segment that joins two non-consecutive verticals.
Term
Rectangle
Definition
A four sided parallelogram where all angles are the same size but sides may not.
Term
Collinear Points
Definition
Two or more points on the same line.
Term
Parallel Lines
Definition
Two or more lines that never cross
Term

Circumcenter of a Triangle

Definition
The point of concurrency of a triangles three perpendicular bisectors.
Term
Perpendicular Bisector of a Line Segment
Definition
A segment that has a line going through it that makes four 90°.
Term
Shortest Distance From Points to a Line and a Plane
Definition
The shortest distance is a perpendicular line.
Term
Equilateral Triangle
Definition
Triangle with three same sized sides and the same sized angles.
Term
Same Side Exterior Angles
Definition
Angles on the same side of a transversal and face away from each other.
Term
Minor Arc
Definition
An arc that is smaller than a semicircle.
Term
Acute Triangle
Definition

A triangle where all angles measure less than 90° but greater than 0°.

Term
Euler Segment
Definition
A line segment that contains the centroid, the orthocenter, and the circumcenter.
Term

Scalene Triangle

Definition
A triangle that doesn't have the same sized angles or sides.
Term
Tangent
Definition
A line on the same plane as the circle it goes through.
Term
Perpendicular Lines
Definition
Two or more lines that cross or intersect at 90° angles.
Term
Isosolese Triangle
Definition
Two of the same sized sides and two angles that are the same size.
Term

Chord

Definition
A line segment that has its two endpoints on the side of a circle.
Term
Concurrent Circles
Definition
Two or more coplaner circles with the same center and radii.
Term
Diameter
Definition
A chord that passes through the center of a circle and has points on the side of the circle.
Term
Midpoint of a Segment
Definition
A point that divides a segment into two equal length parts.
Term
Square
Definition
A regular polygon and a rectangle with two sets of parallel sides and the same sized angles and sides.
Term
Radius
Definition
A chord that has its endpoints in the center and the side of a circle.
Term
Orthocenter of a Triangle
Definition
The point of currency of an angle's three altitudes.
Term
Right Triangle
Definition
A triangle that has an angle that measures 90°.
Term
Supplementary Angles
Definition
Two angles that add up to 180°.
Term
Concentric Circles
Definition
A set of two or more coplaner circles with the same center but different radii.
Term
Arc
Definition
Part of a circle that lies between two points.
Term
Plane
Definition
Length and width but no depth.
Term
Alternate Interior Angles
Definition
Angles facing each other but are on different sides of the transversal.
Term
Complentary Angles
Definition
Two angles that add up to 90°.
Term

Semicircle

Definition
Half of a circle and has the diameter as its base.
Term
Regular Polygon
Definition
Shapes with the same sized sides and angles.
Term
Incenter
Definition

Created by the intersection of the medians.

Term
Major Arc
Definition
An arc that is bigger than a semicircle
Term
Altitude of a Triangle
Definition
A perpendicular segment from a vertex to the base of a triangle.
Term
Point
Definition
No dimensions.
Term
Rhombus
Definition
Four sided polygon with the same sized sides and two sets of the same sized angles.
Term
Alternate Exterior Angles
Definition
Angle facing away from each other and are on different sides of the transversal.
Term
Secant
Definition
A line on the same plane as the circle that it intersects twice.
Term
Acute Angles
Definition
An angle that is less than 90° but more than 0°.
Term
Skew Lines
Definition
Non-coplaner lines.
Term
Coplaner Points
Definition
Two or more points on the same plane.
Term
Right Angle
Definition
An angle with a measure of 90°.
Term
Circumcenter
Definition
Formed by the intersectio of the perpendicular bisectors.
Term
Linear Pair of Angles
Definition
Angles that share a ray when two lines intersect and add up to 180°.
Term
Vertical Angles
Definition
Adjacent angles that are created when two lines intersect.
Term
Obtuse Triangle
Definition
A triangle that has one angle greater than 90° but less than 180°.
Term
Median of a Triangle
Definition

A line segment connecting the vertex of a triangle to the midpoint of the opposite side.

Term
Same Side Interior Angles
Definition
Angles that are on the same side of a transversal and are facing toward each other.
Term
Transversal
Definition
A line that crosses two or more other lines.
Term
Distance Between Two Points
Definition
The shortest distance between two points connected by a line.
Term
Congruent Circles
Definition
Two or more circles with the same radii but have different centers.
Term
Equiangular Polygon
Definition
Shapes that have the same sized angle but doesn't have to have the same sized sides.
Term
Line Segment
Definition
Part of a line, two endpoints and every point in between them.
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