Unit 5 Flashcard Review

Front

What is the scale factor in similar triangles?

Back

The scale factor is the ratio of the lengths of corresponding sides of two similar figures.

Front

How do you determine if two triangles are similar?

Back

Two triangles are similar if they have the same shape, which can be established using the AA (Angle-Angle) criterion.

Front

What does AA stand for in triangle similarity?

Back

AA stands for Angle-Angle, which means if two angles of one triangle are equal to two angles of another triangle, the triangles are similar.

Front

What is the relationship between the angles of similar triangles?

Back

The corresponding angles of similar triangles are equal.

Front

How do you find the measure of an unknown angle in a triangle?

Back

You can find the measure of an unknown angle by using the fact that the sum of the angles in a triangle is always 180 degrees.

Front

What is a dilation in geometry?

Back

A dilation is a transformation that alters the size of a figure but not its shape.

Front

What happens to the dimensions of a figure when it is dilated by a scale factor greater than 1?

Back

The figure becomes larger.

Front

What happens to the dimensions of a figure when it is dilated by a scale factor less than 1?

Back

The figure becomes smaller.

Front

How do you use proportions to find an unknown length in similar triangles?

Back

Set up a proportion using the lengths of corresponding sides of the triangles and solve for the unknown length.

Front

What is the formula for finding the scale factor between two similar triangles?

Back

The scale factor is found by dividing the length of a side of the larger triangle by the length of the corresponding side of the smaller triangle.