BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

ps 2

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 371
Joined: Tue Apr 29, 2008 10:16 am
Thanked: 6 times
Followed by:1 members

ps 2

by vaivish » Tue Aug 05, 2008 10:51 am
. The side surface of a cylinder is reeled with a rectangular plate. If the height of a cylinder tank is 12 feet and the perimeter of the circular base is 9 feet, what is the diagonal of the rectangular plate?
(A) 13
(B) 15
(C) 18
(D) 20
(E) 21


Oa is B
Top
Source: — Problem Solving |
Senior | Next Rank: 100 Posts
Posts: 58
Joined: Fri Jul 18, 2008 12:26 pm
Thanked: 2 times

by malolakrupa » Tue Aug 05, 2008 6:36 pm
Since the rectangular plate is reeled , the height becomes the length and the perimeter of the circular base becomes the breadth and using the famous theorem for right angle triangles ,

diagonal^2 = length^2 + base^2 we get diagonal = 15 which is B.
Top
Master | Next Rank: 500 Posts
Posts: 371
Joined: Tue Apr 29, 2008 10:16 am
Thanked: 6 times
Followed by:1 members

by vaivish » Thu Aug 07, 2008 11:07 am
see 9 is perimeter so the diameter would be 9/pia. so how can we use 9^@ in the equation to get 15 as ans...
Top
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
GMAT Score:800

by Stuart@KaplanGMAT » Thu Aug 07, 2008 11:50 am
vaivish wrote:see 9 is perimeter so the diameter would be 9/pia. so how can we use 9^@ in the equation to get 15 as ans...
The base of the rectangle IS the perimiter of the circle - there's no need to calcluate the circle's diameter.
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Master | Next Rank: 500 Posts
Posts: 371
Joined: Tue Apr 29, 2008 10:16 am
Thanked: 6 times
Followed by:1 members

by vaivish » Sat Aug 09, 2008 6:49 am
can you explain this one please. as i know perimeter is 2*pia* r. So how can it be the base of SQuare. if u draw the diagram it will be more clear to u. Thanks in advance
Top
Legendary Member
Posts: 1159
Joined: Wed Apr 16, 2008 10:35 pm
Thanked: 56 times

by raunekk » Sat Aug 09, 2008 8:17 am
u dont have to use 2 * pie * r...

the circumference of the base of clyinder= the width of the rectangle

height of the cylinder= length of the rectangle.

the diagonal wll be given by d pythagoras theorem.
Top
Senior | Next Rank: 100 Posts
Posts: 48
Joined: Sun Nov 25, 2007 3:27 pm
Location: Colombia Southamerica
Thanked: 1 times

by andes1 » Sat Aug 09, 2008 6:49 pm
????
the circumference of the base of clyinder= the width of the rectangle ???
reeled???
LEARNING ENGLIS H
Top
User avatar
GMAT Instructor
Posts: 3225
Joined: Tue Jan 08, 2008 2:40 pm
Location: Toronto
Thanked: 1710 times
Followed by:614 members
GMAT Score:800

by Stuart@KaplanGMAT » Sat Aug 09, 2008 7:34 pm
andes1 wrote:????
the circumference of the base of clyinder= the width of the rectangle ???
reeled???
"Reeled" is a strange word that I wouldn't expect to see on the real GMAT, but it means "wrapped around".

In other words, you form the rectangle by cutting a straight line down the side of the cylinder and laying out the cylinder flat along the ground. (Picture a piece of paper wrapped all the way around a can - if you were to lay the paper flat, it would be a rectangle.)

So, the height of the cylinder becomes the height of the rectangle and the perimiter of the base of the cylinder ends up becoming the base of the rectangle.
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Senior | Next Rank: 100 Posts
Posts: 48
Joined: Sun Nov 25, 2007 3:27 pm
Location: Colombia Southamerica
Thanked: 1 times

by andes1 » Mon Aug 11, 2008 3:16 pm
thanks a lot
LEARNING ENGLIS H
Top
Post new topic Post Reply
• Page 1 of 1