chapter 9 Flashcards

(6 cards)

1
Q

line of symmetry

A

a line that can divide a polygon into two equal parts

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2
Q

reflections in the coordinate plane

A

across the x-axis: (x, y) - (x, -y)
across the y-axis: (x, y) - (-x, y)
across the line y=x: (x, y) - (y, x)

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3
Q

translations

A

(x, y) - (x +a, y+ b)

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4
Q

Rotations

A

90 degrees about the origin: (x, y) - (-y, x)
180 degrees about the origin: (x, y) - (-x, -y)
270 degrees about the origin: (x, y) - (y, -x)

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5
Q

composition of transformations

A

one transformation followed by another

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6
Q

glide reflection

A

the composition of a translation and a reflection across a line parallel to the translation vector.

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