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by vongochao » Sat Apr 27, 2013 1:38 pm
Oneva wrote:This problem took me 25 minutes to solve. Would something this challenging really be on the GMAT? It seems to be on a whole new level compared to the CAT tests.
you know. it took 2 minutes to solve:

use the area formulation:

1/2 h x ab = r1*r2.
h = 8.
2h = 16.
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by jaspreetsra » Fri Dec 05, 2014 12:31 am
Ans: 16
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by nikhilgmat31 » Wed Aug 05, 2015 12:12 am
Answer is c
we can take it as two right angle triangles with hypotunues as 10 & 17.

Base as (a) & (21-a) .where length of altitude is same.
Using Pythagoras theorem

10^2-a^2 = 17^2 - (21-a)^2

100 - a^2 = 289 - 441 -a^2 + 42 a

42a = 252
a = 6

chord length = 2 * sqrt(10 ^2 - 6^2) = 2* 8 =16

C
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