Author 
Message 
TAGS:

Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 48117

Question Stats:
72% (01:36) correct 28% (01:41) wrong based on 57 sessions
HideShow timer Statistics



Math Expert
Joined: 02 Sep 2009
Posts: 48117

Re M0705
[#permalink]
Show Tags
16 Sep 2014, 00:34
Official Solution:A circle is inscribed in a square with the diagonal of 4 centimeters. What is the approximate area of the square that is not occupied by the circle? A. 1.7 B. 2.7 C. 3.4 D. 5.4 E. 8 The area of a square equals to \(\frac{\text{diagonal}^2}{2}=\frac{4^2}{2}=8\); Next, since the diagonal of the square equals to 4 centimeters then the side of the square equals to \(2\sqrt{2}\) (you can find it for example using Pythagorean theorem: \(a^2+a^2=4^2\)); Now, the radius of inscribed circle will be half of the side of the square, so \(\sqrt{2}\), which makes its area equal to \(\pi{r^2}=2\pi\); Hence, the approximate area of the square that is not occupied by the circle is \(8 2\pi \approx 86.28 = 1.72\). Answer: A
_________________
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? Extrahard Quant Tests with Brilliant Analytics



Intern
Joined: 05 Jul 2016
Posts: 5

Re: M0705
[#permalink]
Show Tags
16 Jul 2016, 15:29
Hello,
if the diagonal is of the square is 4, should the side not be 4/2sqrt? Not 2/2sqrt. This is based on the 454590 special triangle rule.
Thanks



Math Expert
Joined: 02 Sep 2009
Posts: 48117

Re: M0705
[#permalink]
Show Tags
17 Jul 2016, 00:12



Director
Status: I don't stop when I'm Tired,I stop when I'm done
Joined: 11 May 2014
Posts: 551
Location: Bangladesh
Concentration: Finance, Leadership
GPA: 2.81
WE: Business Development (Real Estate)

Bunuel wrote: A circle is inscribed in a square with the diagonal of 4 centimeters. What is the approximate area of the square that is not occupied by the circle?
A. 1.7 B. 2.7 C. 3.4 D. 5.4 E. 8 Side of the square =4/\(\sqrt{2}\) So area of the square =\((\frac{4}{\sqrt{2}})^2\)=8 and area of the circle=\(\pi\)*\((\frac{4}{(\sqrt{2}*2)})^2\)=4\(\pi\) So the approximate area of the square that is not occupied by the circle=84\(\pi\)=84*(>1.5)=8(>6) Only answer Choice A meets the substruction requirement to be less than 2,which is 1.7 Correct answer A
_________________
Md. Abdur Rakib
Please Press +1 Kudos,If it helps Sentence CorrectionCollection of Ron Purewal's "elliptical construction/analogies" for SC Challenges



Intern
Joined: 04 Sep 2016
Posts: 10

Re M0705
[#permalink]
Show Tags
05 Jun 2017, 17:04
I don't agree with the explanation. Answer is wrong here.
it should be 4*pie  8, which is around 4.56.



Math Expert
Joined: 02 Sep 2009
Posts: 48117

Re: M0705
[#permalink]
Show Tags
06 Jun 2017, 09:37



Manager
Joined: 02 May 2016
Posts: 82
Location: India
Concentration: Entrepreneurship
WE: Information Technology (Computer Software)

Re: M0705
[#permalink]
Show Tags
08 Jun 2017, 22:52
MountainGMAT wrote: I don't agree with the explanation. Answer is wrong here.
it should be 4*pie  8, which is around 4.56. Hi! 1. The question says circle is inscribed in a square, and not the other way round! and, 2. No way it can be 4*pie. Area of circle will be 2*pie Answer is correct!



Intern
Joined: 11 Aug 2017
Posts: 5
WE: Account Management (Energy and Utilities)

Re: M0705
[#permalink]
Show Tags
06 Dec 2017, 22:43
Hello,
Why wouldn't the circumference of the cirlce be the same as the diagonal of the square? Thus, the radios would be half of the diagonal, or 4...



Math Expert
Joined: 02 Sep 2009
Posts: 48117

Re: M0705
[#permalink]
Show Tags
06 Dec 2017, 22:54



Intern
Joined: 11 Aug 2017
Posts: 5
WE: Account Management (Energy and Utilities)

Re: M0705
[#permalink]
Show Tags
07 Dec 2017, 10:10
Oh my gosh. Clearly, the end of a long day and got mixed up. What I meant was Diameter, not circumference.
Wouldnt the Diagonal of the square equal the diameter of the circle? So then the radius would be 4?



Math Expert
Joined: 02 Sep 2009
Posts: 48117

Re: M0705
[#permalink]
Show Tags
07 Dec 2017, 10:13



Manager
Joined: 10 Sep 2014
Posts: 74

Re: M0705
[#permalink]
Show Tags
27 Mar 2018, 21:40
Bunuel wrote: Official Solution:
A circle is inscribed in a square with the diagonal of 4 centimeters. What is the approximate area of the square that is not occupied by the circle?
A. 1.7 B. 2.7 C. 3.4 D. 5.4 E. 8
The area of a square equals to \(\frac{\text{diagonal}^2}{2}=\frac{4^2}{2}=8\); Next, since the diagonal of the square equals to 4 centimeters then the side of the square equals to \(2\sqrt{2}\) (you can find it for example using Pythagorean theorem: \(a^2+a^2=4^2\)); Now, the radius of inscribed circle will be half of the side of the square, so \(\sqrt{2}\), which makes its area equal to \(\pi{r^2}=2\pi\); Hence, the approximate area of the square that is not occupied by the circle is \(8 2\pi \approx 86.28 = 1.72\).
Answer: A Bunuel please explain this part "Next, since the diagonal of the square equals to 4 centimeters then the side of the square equals to \(2\sqrt{2}\) (you can find it for example using Pythagorean theorem: \(a^2+a^2=4^2\));"



Math Expert
Joined: 02 Sep 2009
Posts: 48117

Re: M0705
[#permalink]
Show Tags
28 Mar 2018, 02:44
sadikabid27 wrote: Bunuel wrote: Official Solution:
A circle is inscribed in a square with the diagonal of 4 centimeters. What is the approximate area of the square that is not occupied by the circle?
A. 1.7 B. 2.7 C. 3.4 D. 5.4 E. 8
The area of a square equals to \(\frac{\text{diagonal}^2}{2}=\frac{4^2}{2}=8\); Next, since the diagonal of the square equals to 4 centimeters then the side of the square equals to \(2\sqrt{2}\) (you can find it for example using Pythagorean theorem: \(a^2+a^2=4^2\)); Now, the radius of inscribed circle will be half of the side of the square, so \(\sqrt{2}\), which makes its area equal to \(\pi{r^2}=2\pi\); Hence, the approximate area of the square that is not occupied by the circle is \(8 2\pi \approx 86.28 = 1.72\).
Answer: A Bunuel please explain this part "Next, since the diagonal of the square equals to 4 centimeters then the side of the square equals to \(2\sqrt{2}\) (you can find it for example using Pythagorean theorem: \(a^2+a^2=4^2\));" \(side^2 + side^2 = 4^2\); \(2*side^2=16\); \(side^2=8\); \(side=\sqrt{8}=2\sqrt{2}\).
_________________
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? Extrahard Quant Tests with Brilliant Analytics










