Similar Figures

Front

What are similar figures?

Back

Similar figures are shapes that have the same shape but may differ in size. Their corresponding angles are equal, and the lengths of their corresponding sides are proportional.

Front

What is the scale factor in similar figures?

Back

The scale factor is the ratio of the lengths of corresponding sides of two similar figures. It indicates how much one figure has been enlarged or reduced compared to the other.

Front

How do you find the missing side of similar figures?

Back

To find the missing side, set up a proportion using the lengths of the corresponding sides of the similar figures and solve for the unknown.

Front

If two triangles are similar, what can be said about their angles?

Back

If two triangles are similar, their corresponding angles are equal.

Front

What is the relationship between the areas of two similar figures?

Back

The ratio of the areas of two similar figures is equal to the square of the ratio of their corresponding side lengths.

Front

If the scale factor of two similar triangles is 3:2, what is the ratio of their areas?

Back

The ratio of their areas is 9:4, since (3/2)² = 9/4.

Front

How do you determine if two figures are similar?

Back

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

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

If triangle ABC is similar to triangle DEF, and AB = 6 cm, DE = 9 cm, what is the scale factor?

Back

The scale factor is 3:2, since 9 cm / 6 cm = 3/2.

Front

What is the formula for finding the missing side in similar triangles?

Back

If triangle ABC is similar to triangle DEF, then AB/DE = AC/DF = BC/EF.