similarity and scale factor

Front

What are similar figures?

Back

Two objects that are the same shape but not the same size.

Front

What does it mean for angles in similar figures?

Back

All angles in similar figures are congruent.

Front

What is a scale factor?

Back

A number that scales, or multiplies, a quantity.

Front

If a triangle is increased by a scale factor of 3, what happens to its dimensions?

Back

All dimensions are multiplied by 3.

Front

What is the scale factor from a triangle with a base of 6 to a triangle with a base of 9?

Back

3/2 or 1.5.

Front

If the scale factor is 2, what happens to the area of the figure?

Back

The area increases by a factor of 4 (2^2).

Front

If two triangles are similar and one has a base of 4 and the other has a base of 8, what is the scale factor?

Back

2.

Front

What is the relationship between corresponding sides of similar figures?

Back

The ratios of corresponding sides are equal.

Front

If the length of a side in a similar figure is 10 and the scale factor is 1/2, what is the length of the corresponding side in the smaller figure?

Back

5.

Front

How do you find a missing side in similar figures?

Back

Set up a proportion using the known sides.