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IMO B

1. c=2, Not sufficient
2. c=d means sides of the right triangle are equal and hence r=45

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why we are not taking 0 in statement 2??ans should be c?
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we can not assume that these lines repersent X and Y axis. It should be E.
Bunuel chetan2u pls help with this one.
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jim441
we can not assume that these lines repersent X and Y axis. It should be E.
Bunuel chetan2u pls help with this one.

You are right. Edited to avoid confusion. Thank you!
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Which concept is primarily used here in solving this question. As the solutions mentioned below shows it's trignometry; but how it is used here, as it's not included in the gmat focus syllabus.

My Solution:
The line from origin to (c, d) has slope = d/c
When c = d ??? slope = 1 ??? line makes a 45?? angle with x-axis
Please check if this is the only concept tested here from Coordinate geometry.
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The line from origin to (c, d) has slope = d/c
When c = d , the slope = 1
Thus, line makes a 45° angle with x-axis.
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HK12!
Which concept is primarily used here in solving this question. As the solutions mentioned below shows it's trignometry; but how it is used here, as it's not included in the gmat focus syllabus.

My Solution:
The line from origin to (c, d) has slope = d/c
When c = d ??? slope = 1 ??? line makes a 45?? angle with x-axis
Please check if this is the only concept tested here from Coordinate geometry.
Yes, your approach makes sense as a way to solve this one.

Knowledge of trigonometry has never been necessary for answering GMAT questions.
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