Rotation and Dilation

Front

What is the rule for rotating a figure 90 degrees counterclockwise?

Back

(-y, x)

Front

What is the rule for rotating a figure 180 degrees?

Back

(-x, -y)

Front

What is the rule for rotating a figure 270 degrees counterclockwise?

Back

(y, -x)

Front

What are the coordinates of point A(-4, 1) after a 180° rotation about the origin?

Back

A'(4, -1)

Front

What are the coordinates of point B(-2, 1) after a 180° rotation about the origin?

Back

B'(2, -1)

Front

What are the coordinates of point C(-1, -2) after a 180° rotation about the origin?

Back

C'(1, 2)

Front

What is a dilation in geometry?

Back

A transformation that alters the size of a figure, either enlarging or reducing it.

Front

If a triangle is dilated by a scale factor of 2, what happens to its area?

Back

The area is multiplied by 4.

Front

If a triangle is dilated by a scale factor of 0.5, what happens to its perimeter?

Back

The perimeter is multiplied by 0.5.

Front

What is the center of dilation?

Back

The fixed point in a dilation from which all points are expanded or contracted.