Hi Everybody,
The solution of no. 1 problem I have given before is totally correct. Thebasic principle:
The angle subtended at the center is same for arc as well as the triangle formed with radius and chord connecting the arc end points.
Kapil leo, a newcomer of our GMAT Testmagic forum has helped me to clarify the mystery that was us before. Cheers Kapil leo.
For further clarification we can solve the following problem that I have borrowed from TM GMAT Problem Solving
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4.The shape of a tunnel entrance. is of a circle which is 3/4th of the full circle and the base of the entrance is 12 feet across, what is the perimeter, in feet, of the curved portion of the entrance'?
(A) 9π
(B) 12π
(C)
(D) 18π
(E) 9π/sqrt2
Rgds,
Jakir
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