Geometry Fall Review

What is the intersection of two lines? Hint: Draw a picture!

• an angle

• a plane

• a point

• a line

Answer explanation

What are two angles whose sum is 90° called?

• supplementary angles

• vertical angles

• obtuse angles

• complementary angles

Answer explanation

Complementary angles are two angles whose sum is 90°

What are two angles whose sum is 180° called?

• supplementary angles

• vertical angles

• obtuse angles

• complementary angles

Answer explanation

Supplementary angles are two angles whose sum is 180°

Find he measure of angle x.

• 67°

• 76°

• 104°

• 114°

Answer explanation

These angles form a linear pair. Linear pair are supplementary (add to 180°).

Given, "If angles are congruent, then the measures of the angles are equal." Identify the conclusion.

• If the angles are congruent.

• The angles are congruent.

• Then the measures of the angles are equal.

• The measures of the angles are equal.

Answer explanation

A conditional statement is written in the format: If "hypothesis", then "conclusion".

If something is an angle, then it is acute. What is an appropriate counterexample?

• 70⁰

• 45⁰

• 120⁰

• True. There is no counterexample.

Answer explanation

A counterexample is an example that proves that a statement is false. 120⁰ is an angle, but it is obtuse.

What rule describes the translation?

• (x - 6, y + 2)

• (x - 2, y + 6)

• (x + 2, y - 6)

• (x + 6, y - 2)

Answer explanation

To translate, you move right 2 spaces (x+2) and down 6 spaces (y-6).

Which answer shows a reflection across the y-axis?

• a

• b

• c

• d

Answer explanation

Reflection across y-axis: (x, y) --> (-x, y)

Which graph shows the pre-image reflected over y-axis?

• 
• 
• 
• 

Answer explanation

Reflection across y-axis: (x, y) --> (-x, y)

How many lines of symmetry does this shape have?

• 1

• 2

• 3

• 4