Geometry: Unit 3 Review 24/25

Front

What is dilation in geometry?

Back

Dilation is a transformation that alters the size of a figure but not its shape, using a scale factor.

Front

What happens to a figure when it is dilated by a scale factor between 0 and 1?

Back

The figure undergoes a reduction, meaning it gets smaller.

Front

How do you find the coordinates of a transformed image using a scale factor?

Back

Multiply the original coordinates by the scale factor. For example, using (5x, 2y) means multiplying the x-coordinates by 5 and the y-coordinates by 2.

Front

What is a translation in geometry?

Back

Translation is a transformation that moves every point of a figure the same distance in a specified direction.

Front

If point X(1, 4) is translated 3 units left and 9 units down, what are the new coordinates?

Back

X' would be (-2, -5).

Front

What is reflection in geometry?

Back

Reflection is a transformation that flips a figure over a line, creating a mirror image.

Front

How do you reflect a point over the y-axis?

Back

To reflect a point (x, y) over the y-axis, change the sign of the x-coordinate to (-x, y).

Front

What is rotation in geometry?

Back

Rotation is a transformation that turns a figure around a fixed point, called the center of rotation, by a certain angle.

Front

What are the coordinates of point B(-6, -7) after reflecting over the y-axis?

Back

The coordinates after reflection would be (6, -7).

Front

What happens to the coordinates of a point after a 270-degree rotation around the origin?

Back

A 270-degree rotation transforms point (x, y) to (y, -x).