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27 Feb 2019, 23:46
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A
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Difficulty:
25%
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Question Stats:
76% (01:06) correct
24%
(01:46)
wrong
based on 25
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The figure above shows a circular garden plot with center O surrounded by a circular sidewalk, also with center O. If the area covered by the garden and sidewalk together is 169π and of the garden alone is 144π, what is the value of T ?
A. 1
B. 2
C. 3
D. 5
E. 12.5
Attachment:
2019-02-28_1044.png [ 39.53 KiB | Viewed 1108 times ]
28 Feb 2019, 01:54
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Radius of garden+ sidewalk=R
Radius of garden=r
Ar of garden= pi*r^2= 144*pi
r= 12
Ar of garden + sidewalk= pi*R^2= 169*pi
R= 13
Therefore T= R-r=13-12=1
IMO A
Posted from my mobile device
Radius of garden=r
Ar of garden= pi*r^2= 144*pi
r= 12
Ar of garden + sidewalk= pi*R^2= 169*pi
R= 13
Therefore T= R-r=13-12=1
IMO A
Posted from my mobile device
28 Feb 2019, 01:55
Kudos
Bookmarks
Radius of garden+ sidewalk=R
Radius of garden=r
Ar of garden= pi*r^2= 144*pi
r= 12
Ar of garden + sidewalk= pi*R^2= 169*pi
R= 13
Therefore T= R-r=13-12=1
IMO A
Posted from my mobile device
Radius of garden=r
Ar of garden= pi*r^2= 144*pi
r= 12
Ar of garden + sidewalk= pi*R^2= 169*pi
R= 13
Therefore T= R-r=13-12=1
IMO A
Posted from my mobile device
