Draw two lines from center to the end of the base. Now these two line reprent the radius.
Now you have an isoceles triangle with hypoteneus as the base = 12 ft.
Since two other sides (radii) are equal, you get radius = 12/sqrt2.
Now calculate the circuference and multiply this will 3/4 which gives you 9 * pi * sqrt2.
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Source: Beat The GMAT — Problem Solving |
ramesh u should say that the angle subtended at the center is 90 sinnce 1/4 *360=90 then go ahead to solve
Thanks both for your response.
Yes, that is a good point. I was at first wondering why we can determine the triangle 1:1:sqart2 but then I realize the it's 90degree triangle.
Yes, that is a good point. I was at first wondering why we can determine the triangle 1:1:sqart2 but then I realize the it's 90degree triangle.
i think the radius is 6 * sqrt2Ramesh2007 wrote: Since two other sides (radii) are equal, you get radius = 12/sqrt2.
Now calculate the circuference and multiply this will 3/4 which gives you 9 * pi * sqrt2.
only then you get 9* pi * sqrt 2
no?
