Math 420 Core Exam Review

Consider the diagram below. This is an example of:

• Dilating a triangle with a scale factor of 2
• Dilating a triangle with a scale factor of 1
• dilating a triangle with a scale factor of 1/2
• constructing a congruent triangle with compass and straight edge

Consider the diagram below. The pre image, Triangle ABC, is in green. The image, triangle A'B'C', is in red. What is the scale factor of this dilation?

• 1/3
• 1/2
• 2
• 3

Consider the dilation below, with a scale factor of 3. Triangle ABC is the pre-image, triangle A'B'C' is the image. Side AB has a length of 42 mm. What is the length of side A'B'?

• 14 mm
• 21 mm
• 84 mm
• 126mm

Consider the pre-image on the graph below, triangle HIJ. Which choice shows a dialtion about the origin, with a scale factor of 2?

• A
• B
• C
• D

Consider the pre-image on the graph below, triangle HIJ. Which choice shows a dilation about the origin with a scale factor of 1/4?

• A
• B
• C
• D

The two triangles shown below are similar triangles. Find the missing length. Use short, medium, and long sides of each triangle to match corresponsding sides of the similar triangles.

• A
• B
• C
• D

The two triangles shown below are similar triangles. Find the missing length. Use short, medium, and long sides of each triangle to match corresponsding sides of the similar triangles.

• A
• B
• C
• D

The two triangles shown below are similar triangles. Find the missing length. Use short, medium, and long sides of each triangle to match corresponsding sides of the similar triangles.

• A
• B
• C
• D

The two triangles shown below are similar triangles. Find the missing length. Use short, medium, and long sides of each triangle to match corresponsding sides of the similar triangles.

• A
• B
• C
• D

The two triangles shown below are similar triangles. Find the missing length. Use short, medium, and long sides of each triangle to match corresponsding sides of the similar triangles.

• A
• B
• C
• D