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What is the area of rectangular region R ?

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Re: What is the area of rectangular region R ? [#permalink]

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New post 07 Aug 2017, 15:58
mrdlee23 wrote:
Can someone please explain why we can't make four triangles out of the rectangle to determine the third side of each triangle?


How would you do that? Knowing the lengths of the two sides of a triangle is not enough to find the length of the third side.

P.S. This post might also help: https://gmatclub.com/forum/what-is-the- ... ml#p824049
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Re: What is the area of rectangular region R ? [#permalink]

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New post 07 Aug 2017, 17:33
I am fairly weak in quant (especially geometry and number properties); I didn't know that the pythagorean theorem applies only to right triangles.

Thanks

Bunuel wrote:
mrdlee23 wrote:
Can someone please explain why we can't make four triangles out of the rectangle to determine the third side of each triangle?


How would you do that? Knowing the lengths of the two sides of a triangle is not enough to find the length of the third side.

P.S. This post might also help: https://gmatclub.com/forum/what-is-the- ... ml#p824049

Kudos [?]: 14 [0], given: 3

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Re: What is the area of rectangular region R ? [#permalink]

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New post 07 Aug 2017, 23:58
mrdlee23 wrote:
I am fairly weak in quant (especially geometry and number properties); I didn't know that the pythagorean theorem applies only to right triangles.

Thanks

Bunuel wrote:
mrdlee23 wrote:
Can someone please explain why we can't make four triangles out of the rectangle to determine the third side of each triangle?


How would you do that? Knowing the lengths of the two sides of a triangle is not enough to find the length of the third side.

P.S. This post might also help: https://gmatclub.com/forum/what-is-the- ... ml#p824049


I suggest to read the following topics:
ALL YOU NEED FOR QUANT ! ! !
Ultimate GMAT Quantitative Megathread

For Geometry check below:

23. Geometry




24. Coordinate Geometry




25. Triangles




26. Polygons




27. Circles




28. Rectangular Solids and Cylinders




29. Graphs and Illustrations



_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

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Re: What is the area of rectangular region R ? [#permalink]

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New post 25 Oct 2017, 17:59
This one doesn't make sense to me. It says that both diagonals are of equal length. That is only possible if the rectangular is a square (a special form of a rectangle). If each diagonal is 5, then each side of the square can be calculated as root of (2.5^2+2.5^2). If each side can be determined, it is sufficient (A).

What am I missing.

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Re: What is the area of rectangular region R ? [#permalink]

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New post 25 Oct 2017, 21:29
gmattaker111 wrote:
This one doesn't make sense to me. It says that both diagonals are of equal length. That is only possible if the rectangular is a square (a special form of a rectangle). If each diagonal is 5, then each side of the square can be calculated as root of (2.5^2+2.5^2). If each side can be determined, it is sufficient (A).

What am I missing.


1. All rectangles, not necessarily square, have equal diagonals.
2. If the diagonal of a square is 5, then x^2 + x^2 = 5^2, not what you've written.
3. You should brush-up fundamentals. Check the the links here: https://gmatclub.com/forum/what-is-the- ... l#p1903104

Hope it helps.
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New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
Extra-hard Quant Tests with Brilliant Analytics

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Re: What is the area of rectangular region R ? [#permalink]

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New post 25 Oct 2017, 22:21
Answer C
Statement 1: By only from diagonal we cannot tell the area of Rectangle. Insufficient
Statement: B y only from perimeter we cannot tell the area of the Rectangle . Insufficient.

Both A & B we can tell the area of Rectangle So sufficient.
C
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Re: What is the area of rectangular region R ?   [#permalink] 25 Oct 2017, 22:21

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