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Geometry Terms

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Section 1

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Coordinate Plane

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Geometry Math

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Date created

Mar 1, 2020

Cards (50)

Section 1

(50 cards)

Coordinate Plane

Front

A 4-section gridded flat surface that is separated by a horizontal (x) and vertical (y) axis.

Back

Adjacent Angles (Notation: <ABC adj. <CBD)

Front

Two angles that are next to each other, sharing a ray and a vertex but no interior points.

Back

Altitude

Front

Segment connecting a triangle vertex and its opposite side at a 90 degree angle (height of the triangle).

Back

Scalene Triangle

Front

Triangle with no equal sides.

Back

Perpendicular Lines

Front

Two lines that intersect at a 90 degree angle.

Back

Plane (Notation: Plane ABCD)

Front

A set of points that extends without end in all directions along a flat surface.

Back

Midpoint (Notation: Pt. M)

Front

The point in the center of a segment that separates a segment into two equal parts.

Back

Obtuse Triangle

Front

Triangle with one angle greater than 90 degrees.

Back

Concave

Front

A polygon where one or more diagonals can pass outside the figure.

Back

Supplementary Angles (Notation: <ABC sup. <DEF)

Front

Angles that together add up to 180 degrees (make a straight line).

Back

Line

Front

A set of points that extends without end in 2 opposite directions.

Back

Parallel Planes (Notation: Plane DCEF // Plane ABHG)

Front

Planes that never intersect.

Back

Interior

Front

Located inside a figure or between parallel lines.

Back

Congruent

Front

Equal in size and shape.

Back

End Points (Notation: Pt. A, B)

Front

Two points that define the length of a segment; the points where a segment ends.

Back

Skew Lines

Front

Lines that never touch that are not on the same plane.

Back

Equiangular Triangle

Front

A triangle with all equal interior angles.

Back

Vertex (Notation: Pt. B)

Front

The shared point where the rays of an angle meet.

Back

Vertical Angles (Notation: <a vert. <b)

Front

Angles that are opposite each other where two lines cross.

Back

Regular Polygon

Front

A Polygon with all equal sides and all equal interior angles.

Back

Point (Notation: Pt. P)

Front

Location in space. . P

Back

Linear Pair (Notation: <1, <2)

Front

Two angles that are next to each other (sharing a ray and a vertex but no interior points) that combine to make a straight line.

Back

Right Angle (Notation: <ABC)

Front

A 90 degree angle.

Back

Obtuse Angle (Notation: <BAC)

Front

An angle between 90 and 180 degrees.

Back

Ray

Front

A line that only extends in one direction and has one endpoint.

Back

Hypotenuse

Front

The longest side of a right triangle, always opposite the 90 degree angle.

Back

Co-planar (Notation: Pt. A, B, C)

Front

Together on the same plane.

Back

Line Segment

Front

A part of a line. Has two endpoints.

Back

Collinear Points (Notation: Pt. L, P, O)

Front

Points together on the same line.

Back

Parallel Lines

Front

Lines that never touch and are on the same plane.

Back

Angle (Notation: <ABC)

Front

Two rays that share an endpoint.

Back

Acute Triangle

Front

Triangle with all interior angles less than 90 degrees..

Back

Reflex Angle (Notation: <LMN)

Front

An angle between 180 and 360 degrees.

Back

Midline

Front

Segment connecting the midpoints of two legs of a triangle or the midpoints of the non-parallel sides of a trapezoid.

Back

Bisector

Front

A point or ray that cuts a segment or angle into two equal pieces.

Back

Complementary Angles (Notation: <ABC sup. <DEF)

Front

Angles that together add up to 90 degrees.

Back

Exterior

Front

Located outside a figure or outside the space between parallel lines.

Back

Irregular Polygon

Front

A polygon where one or more angles or sides is not equal.

Back

Polygon

Front

A closed figure with straight sides that intersect only at endpoints.

Back

Tangent Lines

Front

Lines that touch a figure at only one point.

Back

Non-collinear Points (Notation: Pt. A, B, E)

Front

Points not on the same line.

Back

Isosceles Triangle

Front

Triangle with two equal sides.

Back

Convex

Front

A polygon where no diagonals can pass outside the figure.

Back

Right Triangle

Front

Triangle with one 90 degree angle.

Back

Equilateral Triangles

Front

Triangles with all equal sides.

Back

Straight Angle (Notation: <QPR)

Front

An angle equal to 180 degrees.

Back

Acute Angle (Notation: <JKL)

Front

An angle less than 90 degrees.

Back

Non-Coplanar (Notation: Pt. S, T, Q)

Front

Points not together on the same plane.

Back

Median

Front

Segment connecting a triangle vertex with the midpoint of the opposite side.

Back

Leg

Front

An outer ray of an angle; one of the two shorter sides of a right triangle that always connect at the 90 angle.

Back