Square

Expert replies

heshamelaziry: Legendary Member; Posts: 869; Joined: Wed Aug 26, 2009 3:49 pmFollowed by: 3 members; Location: California; Thanked: 13 times

by heshamelaziry » Mon Nov 02, 2009 7:18 pm

E, F, G, and H are the vertices of a polygon. Is polygon EFGH a square?

(1) EFGH is a parallelogram.

(2) The diagonals of EFGH are perpendicular bisectors of one another.

OA E

Please tell me the rules for this one. i.e, all squares are rectangles, but not all rectangles are squares

Like this post

Source: Beat The GMAT — Data Sufficiency | Mon Nov 02, 2009 7:18 pm

life is a test: Master | Next Rank: 500 Posts; Posts: 138; Joined: Mon Mar 02, 2009 12:02 pm; Thanked: 15 times

Re: Square

by life is a test » Mon Nov 02, 2009 8:30 pm

heshamelaziry wrote:E, F, G, and H are the vertices of a polygon. Is polygon EFGH a square?

(1) EFGH is a parallelogram.

(2) The diagonals of EFGH are perpendicular bisectors of one another.

OA E

Please tell me the rules for this one. i.e, all squares are rectangles, but not all rectangles are squares

1. not all parallelograms are square but a square is a parallelogram so insuff

2. this means that it is a rhombus (all sides are equal) but you could have a diamond shape rhombus which is not a square hence insuff

1 and 2 doesnt tell you anything new since a rhombus is always a parallelogram anyway hence insuff.

to figure out that a shape is a square we need to know that all its sides are equal and has 4 right angles (i.e. is a rhombus and is a rectangle). Here we know the sides are equal but we dont know if the angles condition holds.

hope that helps.

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review