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
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'?
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