Shared Flashcard Set

Details

Geometric Relationships
Mr. Bouchillon's 6th Grade Math Class
40
Mathematics
6th Grade
02/09/2009

Additional Mathematics Flashcards

 


 

Cards

Term
Line
Definition
A line is a straight path that extends without end in opposite directions. A line is named by two points on the line.
Term
Point
Definition
A point is an exact location. A point is named by a capital letter.
Term
Plane
Definition
A plane is a flat surface that extends without end in all directions. A plane is named by three points on the plane that are not on the same line.
Term
Line Segment
Definition
A line segment is made of two endpoints and all the points between the endpoints. A line segment is named by its endpoints.
Term
Ray
Definition
A ray has one endpoint. From the endpoint, the ray extends without end in one direction only. A ray is named by its endpoint first followed by another point on the ray.
Term
Angle
Definition
An angle is formed by two rays with a common endpoint.
Term
Vertex
Definition
The vertex is a common endpoint for an angle formed by two rays.
Term
Acute Angle
Definition
An acute angle measures less than 90°.
Term
Right Angle
Definition
A right angle measures exactly 90°.
Term
Obtuse Angle
Definition
An obtuse angle measures more than 90° and less than 180°.
Term
Straight Angle
Definition
A straight angle measures exactly 180°.
Term
Congruent
Definition
When angles have the same measure, they are said to be congruent.
Term
Vertical Angles
Definition
Vertical angles are formed opposite each other when two lines intersect. Vertical angles have the same measure, so they are always congruent.
Term
Adjacent Angles
Definition
Adjacent angles are side by side and have a common vertex and ray. Adjacent angles may or may not be congruent.
Term
Complementary Angles
Definition
Complementary angles are two angles whose measures have a sum of 90°.
Term
Supplementary Angles
Definition
Supplementary angles are two angles whose measures have a sum of 180°.
Term
Parallel lines
Definition
Parallel lines are lines in the same plane that never intersect.
Term
Perpendicular lines
Definition
Perpendicular lines intersect to form 90° angles, or right angles.
Term
Skew lines
Definition
Skew lines are lines that lie in different planes. They are neither parallel nor intersecting.
Term
Acute triangle
Definition
An acute triangle has only acute angles.
Term
Obtuse triangle
Definition
An obtuse triangle has one obtuse angle.
Term
Right triangle
Definition
A right triangle has one right angle.
Term
Scalene triangle
Definition
A scalene triangle has no congruent sides.
Term
Isosceles triangle
Definition
An isosceles triangle has at least two congruent sides.
Term
Equilateral triangle
Definition
An equilateral triangle has three congruent sides.
Term
Quadrilateral
Definition
A quadrilateral is a plane figure with four sides and four angles.
Term
Parallelogram
Definition
Opposite sides are parallel and congruent. Opposite angles are congruent.
Term
Rectangle
Definition
Parallelogram with four right angles.
Term
Rhombus
Definition
Parallelogram with four congruent sides.
Term
Square
Definition
Rectangle with four congruent sides.
Term
Trapezoid
Definition
Quadrilateral with exactly two parallel sides. May have two right angles.
Term
Polygon
Definition
A polygon is a closed plane figure formed by three or more line segments.
Term
Regular polygon
Definition
A regular polygon is a polygon in which all sides are congruent and all angles are congruent.
Term
Transformation
Definition
A rigid transformation moves a figure without changing its size or shape. So the original figure and the transformed figure are always congruent.
Term
Translation
Definition
A translation is the movement of a figure along a straight line.
Term
Rotation
Definition
A rotation is the movement of a figure around a point. A point of rotation can be on or outside a figure.
Term
Reflection
Definition
When a figure flips over a line, creating a mirror image, it is called a reflection.
Term
Line of reflection
Definition
When a figure flips over a line, creating a mirror image, it is called a reflection. The line the figure is flipped over is called line of reflection.
Term
Line symmetry
Definition
A figure has line symmetry if it can be folded or reflected so that the two parts of the figure match, or are congruent.
Term
Line of symmetry
Definition
If a figure has line symmetry, the line of reflection is called the line of symmetry.
Supporting users have an ad free experience!