# math:^]

Which of the following are also representations of (2.5, 135 degrees)? Select all that apply. [2 answers]
a. (2.5, -225 degrees)
b. (-2.5, -225 degrees)
c. (-2.5, 45 degrees)
d. (-2.5, -45 degrees)
e. (-2.5, 315 degrees)

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1. what is 135-360?

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bobpursley
2. 135-360=-225

But how do determine the first number?

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3. Ignore that question.

Are the answers A and B?

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4. Clearly not both A and B, since they have the same angle, but opposite values for r.
A is correct, since 135-360 = -225

Now, if you want r to be -2.5, then your angle needs to be in the opposite direction, or
135-180 = -45. That would be D

Try actually plotting the point and seeing which angles get there, using positive and negative values for r.

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