Source: Official Guide for the GMAT 13th Ed. Data Sufficiency; #11 Official Guide for the GMAT 2015 14th Ed. Data Sufficiency; #11

1

In the xy-plane above, is angle QPR

In the xy-plane above, is angle QPR a right angle?

1 Explanation

1

Gravatar Mike McGarry, Magoosh Tutor

Dec 30, 2013 • Comment

What if P and Q have both the same x-coordinate and y coordinate? In that case, there will be no right angle QPR. The same goes to R and P. What's wrong in that reasoning?

Apr 6, 2016 • Reply

Cydney Seigerman, Magoosh Tutor

Good question! If P and Q had the same x and y coordinate, they would be the same point. In that case, we would not have a triangle but rather a line segment from P/Q to R. This would also be the case if R and P shared both their x and y coordinate. The two points would be the same point and on the coordinate plane, we would observe a line segment from R/P to Q.

Apr 17, 2016 • Reply

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Official Guide for the GMAT 2015 14th Ed.

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Section 6.3 Data Sufficiency

Section 6.3 Data Sufficiency

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