Geometry Terms - chapter 9 Flashcards
center of dilation
the intersection of the lines that connect each point of the image with the corresponding point of the preimage
composition of transformations
one transformation followed by another transformation
enlargement
a dilation with a scale factor greater than one
frieze pattern
a pattern that has translation symmetry along a line
glide reflection
a composition of a translation and a reflection across a line parallel to the translation vector
glide reflection symmetry
a pattern has glide reflection symmetry if it coincides with its image after a glide reflection
isometry
a transformation that does not change the size or shape of a figure
line symmetry
a figure has this symmetry if it can be reflected across a line so that the image coincides with the preimage
line of symmetry
a line that divides a plane figure into two congruent reflected halves
reduction
a dilation with a scale factor greater than 0 but less than 1
regular tessellation
a repeating pattern of congruent regular polygons that completely covers a plane with no gaps or overlaps
rotational symmetry
a figure has this symmetry if it can be rotated about a point by an angle less than 360 degrees so that the image coincides with the preimage
semiregular tessellation
a repeating pattern formed by two or more regular polygons in which the same number of each polygon occur, in the same order, at every vertex, and they completely cover a plane with no gaps or overlaps
symmetry
a figure has symmetry if it can be transformed so that the image coincides with the preimage
tessellation
a repeating pattern of plane figures that completely covers a plane with no gaps or overlaps
