8th Math STAAR Review Transformations

Front

What is a transformation in geometry?

Back

A transformation is an operation that moves or changes a figure in some way on a coordinate grid.

Front

What are the four main types of transformations?

Back

The four main types of transformations are translation, rotation, reflection, and dilation.

Front

What does a translation do to a figure?

Back

A translation moves a figure from one location to another without changing its shape or size.

Front

What is a reflection in geometry?

Back

A reflection flips a figure over a line, creating a mirror image.

Front

What is a rotation in geometry?

Back

A rotation turns a figure around a fixed point, known as the center of rotation.

Front

What is a dilation in geometry?

Back

A dilation resizes a figure by a scale factor, either enlarging or reducing it.

Front

What does it mean for a transformation to preserve congruence?

Back

A transformation preserves congruence if the original figure and the transformed figure are the same size and shape.

Front

Which transformation does NOT preserve congruence?

Back

Dilation does not preserve congruence if the scale factor is not equal to 1.

Front

What is the rule for a 180-degree rotation about the origin?

Back

The rule for a 180-degree rotation about the origin is (x, y) -> (-x, -y).

Front

How does a reflection across the x-axis affect the coordinates of a point?

Back

A reflection across the x-axis changes the sign of the y-coordinate: (x, y) -> (x, -y).