This lesson explains how to determine if two triangles are similar by using similarity transformations. It covers the types of transformations: translation, reflection, rotation, and dilation, and how they affect the size and shape of triangles. The lesson also discusses the properties of similar triangles, such as proportional sides and congruent angles. Through examples, it demonstrates how to verify the similarity of triangles using these transformations and properties.

What is the main purpose of similarity transformations in geometry?

• To maintain both the shape and size of a polygon

• To maintain the shape of a polygon while possibly changing its size

• To change the size of a polygon

• To change the shape of a polygon

Which transformation involves moving a triangle without altering its size?

• Rotation

• Reflection

• Translation

• Dilation

Which transformation involves flipping a triangle over a line of symmetry?

• Reflection

• Translation

• Rotation

• Dilation

What is a key property of similar triangles?

• Corresponding sides are proportional

• They have no congruent angles

• All angles are different

• All sides are equal

In the example of triangles DEF and CAB, what is the scale factor?

• 2/3

• 3/2

• 5/3

• 3/5

Which angle in triangle BIG is congruent to angle O in triangle DOG?

• Angle B

• Angle I

• Angle G

• Angle D

What is the sum of the angles in any triangle?

• 270 degrees

• 360 degrees

• 180 degrees

• 90 degrees

What transformation is used to verify the similarity of triangles RED and RIG?

• Dilation

• Rotation

• Reflection

• Translation

Which property is used to confirm that angle R is congruent to itself in triangles RED and RIG?

• Corresponding Angles

• Reflexive Property

• Vertical Angles

• Alternate Interior Angles

What is the ratio of side lengths RG to RD in triangles RED and RIG?

• 2/3

• 2/1

• 3/2

• 1/2