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Bunuel
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Explanation:

r = \(\frac{\sqrt{(b^2 + c^2)(b^2 + (a + c)^2)}}{2b}\)

Here a=2, b=8, c=2

r = \(\frac{\sqrt{(8^2 + 2^2)(8^2 + (2 + 2)^2)}}{2*8}\)

r = √85/2

IMO-B
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hi rajatchopra1994

What are a, b & c taken in the equation?
Do you expect to solve GMAT questions using this type of formula?
Please elaborate your solution with a proper diagram.


rajatchopra1994
Explanation:

r = \(\frac{\sqrt{(b^2 + c^2)(b^2 + (a + c)^2)}}{2b}\)

Here a=2, b=8, c=2

r = \(\frac{\sqrt{(8^2 + 2^2)(8^2 + (2 + 2)^2)}}{2*8}\)

r = √85/2

IMO-B
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Posted from my mobile device
My approach is looking at diagram it is difficult to add 5th square, hence dia should be greater then 8 but less then 10. Hence radius should be greater then 4 and less then 5 so and is B
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Kinshook
hi rajatchopra1994

What are a, b & c taken in the equation?
Do you expect to solve GMAT questions using this type of formula?
Please elaborate your solution with a proper diagram.


rajatchopra1994
Explanation:

r = \(\frac{\sqrt{(b^2 + c^2)(b^2 + (a + c)^2)}}{2b}\)

Here a=2, b=8, c=2

r = \(\frac{\sqrt{(8^2 + 2^2)(8^2 + (2 + 2)^2)}}{2*8}\)

r = √85/2

IMO-B

Dear Kinshook

Please check the below link for the formula:

https://gmatclub.com/forum/what-is-the-radius-of-the-circle-shown-above-in-terms-of-a-b-and-c-326929.html

here length b is equal to the sum of sides of horizontal square i.e. 2+2+2+2 = 8
a = Side of Square & b = Side of Square.

Already solved these type of Questions 3-4 times.. that's why used formula.

Regards,
Rajat Chopra
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Attaching image for better understanding Kinshook

Regards,
Rajat Chopra

Posted from my mobile device
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