SAT II Math I : Symmetry

Study concepts, example questions & explanations for SAT II Math I

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Example Questions

Example Question #1 : Symmetry

Given a point , what is the new  value if this point is flipped across the line ?

Possible Answers:

Correct answer:

Explanation:

The displacement between negative three and positive one is four.

This mean that after flipping the point, it must be symmetrical to its original location.   The new point must also be 4 units to the right of the line.

The new point would be located at:  

The answer is:  

Example Question #2 : Symmetry

Which of the following symmetries applies to the graph of the relation

 ?

I) Symmetry with respect to the origin

II) Symmetry with respect to the -axis

III) Symmetry with respect to the -axis

Possible Answers:

II only

III only

I, II and III

None of these

I only

Correct answer:

III only

Explanation:

The relation 

is a circle with center  and radius  .

In other words, it is a circle with center at the origin, translated right  units and up  units (the radius is irrelevant to the question).

or

is this circle translated right zero units and up 2 units. The upshot is that the circle moves along the -axis only, and therefore is symmetric with respect to the -axis, but not the -axis. Also, as a consequence, it is not symmetric with respect to the origin.

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