Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 03 May 2015, 17:29

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Is quadrilateral ABCD a rectangle? (A top left clockwise to

Author Message
TAGS:
Current Student
Joined: 29 Jan 2005
Posts: 5244
Followers: 23

Kudos [?]: 179 [0], given: 0

Is quadrilateral ABCD a rectangle? (A top left clockwise to [#permalink]  26 Oct 2005, 06:41
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
Is quadrilateral ABCD a rectangle? (A top left clockwise to D)

1. The area of triangle ABD is 1/2 the area of ABCD
2. The area of triangle ABC is 1/2 the area of ABCD
Manager
Joined: 01 Aug 2005
Posts: 68
Followers: 1

Kudos [?]: 5 [0], given: 0

E. You are missing information on one of the sides, which could result in it not being a rectangle. (The two triangle areas overlap, so 1/2+1/2 does not equal the whole area of the figure)
SVP
Joined: 24 Sep 2005
Posts: 1893
Followers: 11

Kudos [?]: 139 [0], given: 0

Re: DS Kaplan Math Book Test 1 #23 [#permalink]  26 Oct 2005, 09:25
GMATT73 wrote:
Is quadrilateral ABCD a rectangle? (A top left clockwise to D)

1. The area of triangle ABD is 1/2 the area of ABCD
2. The area of triangle ABC is 1/2 the area of ABCD

A case of ABCD like my illustration demonstrates why ABCD is not nescessarily a rectangle.
Attachments

Doc2.doc [23.5 KiB]

Senior Manager
Joined: 26 Jul 2005
Posts: 315
Location: Los Angeles
Followers: 1

Kudos [?]: 6 [0], given: 0

I got an <b>E</b> without doing too much work on this. Using logic and a visual, I think it is entirely possible to have the 2 triangles overlap and as xennie mentioned, the areas will not equal the total area of the quad. We need more information.
Manager
Joined: 14 Apr 2003
Posts: 84
Followers: 1

Kudos [?]: 1 [0], given: 0

Re: DS Kaplan Math Book Test 1 #23 [#permalink]  26 Oct 2005, 12:36
GMATT73 wrote:
Is quadrilateral ABCD a rectangle? (A top left clockwise to D)

1. The area of triangle ABD is 1/2 the area of ABCD
2. The area of triangle ABC is 1/2 the area of ABCD

A paralellogram for sure.

But a parallelogram is not recatngle unless the angles are at 90.

So E.
Manager
Joined: 17 Sep 2005
Posts: 72
Location: California
Followers: 1

Kudos [?]: 6 [0], given: 0

E for me too.

Stmt's 1 and 2 alone aren't sufficient => CE
Stmts taken together might mean its a RECTANGLE or a PARALLELOGRAM or RHOMBUS, etc..
NOT SUFF => E
Current Student
Joined: 29 Jan 2005
Posts: 5244
Followers: 23

Kudos [?]: 179 [0], given: 0

Yep, OA is E. The sides must be at 90 degrees to be a rectangle.
Senior Manager
Joined: 26 Jul 2005
Posts: 315
Location: Los Angeles
Followers: 1

Kudos [?]: 6 [0], given: 0

Yep - it appears that the GMAT likes to trick you into thinking quadrilaterals are rectangles, squares, rhombuses, etc. Some things to remember:

<b>Parallelogram:</b> Opposite sides are equal

<b>Rectangle:</b> All angles are 90 degrees & opposite sides are equal

<b>Rhombus:</b> All sides are equal & opposite angles are equal

<b>Square:</b> All angles are 90 degrees & all sides are equal

<b>Trapezoid:</b> One pair of opposite sides is parallel
SVP
Joined: 24 Sep 2005
Posts: 1893
Followers: 11

Kudos [?]: 139 [0], given: 0

ValleyBall1 wrote:
Yep - it appears that the GMAT likes to trick you into thinking quadrilaterals are rectangles, squares, rhombuses, etc. Some things to remember:

<b>Parallelogram:</b> Opposite sides are equal

<b>Rectangle:</b> All angles are 90 degrees & opposite sides are equal

<b>Rhombus:</b> All sides are equal & opposite angles are equal

<b>Square:</b> All angles are 90 degrees & all sides are equal

<b>Trapezoid:</b> One pair of opposite sides is parallel

Thank you for providing those jargons!!
Current Student
Joined: 29 Jan 2005
Posts: 5244
Followers: 23

Kudos [?]: 179 [0], given: 0

Great information Valleyball! This is exactly the terminology we need to be familiar with.
Senior Manager
Joined: 26 Jul 2005
Posts: 315
Location: Los Angeles
Followers: 1

Kudos [?]: 6 [0], given: 0

No problem! Now we just need to memorize them so we'll be able to quickly identify a GMAT trick question (especially in DS).
Similar topics Replies Last post
Similar
Topics:
4 Is quadrilateral ABCD a rectangle? 2 16 Jul 2013, 18:23
1 Is quadrilateral ABCD a rectangle? 10 09 Sep 2010, 06:42
4 Is quadrilateral ABCD a rectangle? 13 23 Jan 2010, 20:18
Is quadrilateral ABCD a rectangle? (1) Angle ABC and BCD are 10 06 Sep 2007, 19:26
Is quadrilateral ABCD a rectangle? (1) Line segments AC and 6 28 Aug 2007, 20:19
Display posts from previous: Sort by