Illustrative Grade 8 Unit 2

Front

What is a scale factor in geometry?

Back

A scale factor is a number that scales, or multiplies, some quantity. In geometry, it is the ratio of the lengths of two corresponding sides of two similar figures.

Front

What happens to the angles in a dilation?

Back

Angles do not change in scale copies; they remain the same.

Front

How do you find the new coordinates of a point after dilation?

Back

To find the new coordinates after dilation, multiply the original coordinates by the scale factor.

Front

What is the result of a dilation?

Back

A dilation produces a similar figure, which means the shape is the same but the size may differ.

Front

What are alternate interior angles?

Back

Alternate interior angles are pairs of angles that are on opposite sides of a transversal and inside the two lines.

Front

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

Back

The triangle will become twice as large.

Front

What is the difference between congruent figures and similar figures?

Back

Congruent figures are identical in shape and size, while similar figures have the same shape but may differ in size.

Front

What is the scale factor when a triangle is reduced to half its size?

Back

The scale factor is 1/2.

Front

What is the relationship between corresponding sides of similar figures?

Back

The lengths of corresponding sides of similar figures are proportional.

Front

What is a dilation centered at the origin?

Back

A dilation centered at the origin means that the figure is enlarged or reduced from the origin point (0,0) using a scale factor.