Scale Factor Review

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity. It is used to enlarge or reduce figures in geometry.

Front

If a rectangle has a perimeter of 15 inches and a scale factor of 2, what is the new perimeter?

Back

30 inches

Front

What does it mean for two figures to be similar?

Back

Two figures are similar if their corresponding angles are equal and the ratios of their corresponding sides are equal.

Front

If line CB corresponds with line RQ, what can we infer about their relationship?

Back

They are corresponding lines in similar figures.

Front

How do you find the area of a figure when given a scale factor?

Back

Multiply the scale factor by itself (scale factor x scale factor) to find the area of the new figure.

Front

What is the perimeter of a rectangle with a length of 5 inches and a width of 2 inches?

Back

14 inches (Perimeter = 2(length + width) = 2(5 + 2) = 14).

Front

If the scale factor is 3, how does it affect the dimensions of a shape?

Back

Each dimension of the shape is multiplied by 3.

Front

What is the relationship between corresponding angles in similar figures?

Back

Corresponding angles in similar figures are equal.

Front

If the scale factor is 1/2, what happens to the size of the figure?

Back

The figure is reduced to half its original size.

Front

What is the formula for the perimeter of a rectangle?

Back

Perimeter = 2(length + width).