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Unit 1 Vocabulary

Unit 1 - Transformations Vocabulary

TermDefinition
point An undefined term; it names a location and has no size.
line An undefined term; A line is a straight path that has no thickness and extends forever.
plane An undefined term; it is a flat surface that has no thickness and extends forever.
circle The set of points in a plane that are a fixed distance from a given point called the center of the circle.
angle A figure formed by two rays with a common endpoint.
perpendicular Line Lines that intersect at 90° angles.
parallel Line Lines in the same plane that do no intersect.
line segment Part of a line that is bounded by two distinct endpoints.
bisector Cuts an object into two equal parts.
congruent Having the same size and shape, denoted by ≅ .
corresponding angles Angles in the same position in two different polygons that have the same number of angles.
corresponding sides Sides in the same position in two different polygons that have the same number of sides.
endpoint A point at an end of a segment or the starting point of a ray.
intersection A point at which two things intersect.
ray
segment
vertex
angle of rotation An angle formed by a rotating ray; called the terminal side, and a stationary reference ray, called the initial side.
image A shape that results from a transformation of a figure know as the pre-image.
isometry A transformation that does not change the size or shape of a figure.
pre-image The original figure in a transformation.
reflection
line of reflection
rotation
transformation
translation
horizontal stretch
vertical stretch
symmetry
line symmetry A figure that can be reflected across a line so that the image coincides with the pre-image.
rotational symmetry A figure that can be rotated about a point by an angle less than 360° so that the image coincides with the pre-image.
order of rotational symmetry The number of times a figure with rotational symmetry coincides with itself as it rotates 360°.
vector A quantity that has both magnitude and direction.
dilation A transformation that changes the size of a figure but not its shape.
rigid transformations A transformation that does not change the size or shape of a figure.
isometric transformations Transformations that don't change the size or shape of an object. Three types: Translations, Rotations, Reflections
corresponding parts Refers to the parts of two objects that are in the same relative position.
coincide To correspond exactly; to be identical.
Created by: AWarner