Math Geometry Review

Find the number of degrees in the third angle of the triangle

• 155
• 112
• 74
• 68

Solve for the variable.

• 55
• 80
• 265
• 47

In the diagram, DC is the perpendicular bisector of AB and CE is the angle bisector of <ACD.  Find the measure of <ACE

• 90
• 45
• 30
• 15

Find the measure of ∠ACD. 

• 130
• 115
• 65
• 50

Which of the following transformations carry this regular polygon onto itself?

• Reflection across line l
• Rotation of 45° counterclockwise
• . Rotation of 60° counterclockwise
• Rotation of 72° counterclockwise

Which transformation maps ∆ HEN  to ∆ H'E'N' ?

• rotation
• translation
• glide reflection
• reflection

Apply a dilation with a scale factor of ½ to triangle ABC. Let the image be triangle A’B’C’. Which one of the following equations is true?

• A’B’ = ½ (AB)
• AB = ½ (A’B’)
• m∠A’ = ½ (m∠A)
• m∠A = ½ (m∠A’)

Which Scale Factor below results in an image SMALLER than the original figure?

• r ‹ 0   
  
• 0 ‹ r ‹ 1
• r = 1   
• r › 1

A triangle is dilated about center O with a scale factor of  r=1.  How will the size of the image compare to the size of the pre-image?

• the image will be larger than the pre-image
• the image will be exactly the same size as the pre-image
• the image will be smaller than the pre-image
• the pre-image will be larger than the image

How does the location of the image compare to the location of the pre-image after a dilation about point O, by a scale factor of  r=1/4 ?

• the image will be farther away from point O
• the image and pre-image will be equal distances from point O
• the image will be closer to point O
• the pre-image will be closer to point O