DS - Interesting Question

[saikris26]

In Quadrilateral WXYZ, is XY perpendicular to YZ?

1. WXY is a right angle
2. WZY is a right angle

Can some one answer this question, please

[RonPurewal]

In Quadrilateral WXYZ, is XY perpendicular to YZ?

1. WXY is a right angle
2. WZY is a right angle

Can some one answer this question, please

should be (e).

they're asking whether the angle at Y is a right angle.
even if you have the two statements together, you only know that the angles at X (from statement 1) and at Z (from statement 2) are right angles.
this isn't good enough; the angles at W and Y can be any two angles that add to 180 degrees.