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Problem 297: (2001 AMC 10, 17)
Which of the cones listed below can be formed from a $252^\circ$ sector of a circle of radius $10$ by aligning the two straight sides? $\textbf{(A) } \text{A cone with slant height of 10 and radius 6}$ $\textbf{(B) } \text{A cone with height of 10 and radius 6}$ $\textbf{(C) } \text{A cone with slant height of 10 and radius 7}$ $\textbf{(D) } \text{A cone with height of 10 and radius 7}$ $\textbf{(E) } \text{A cone with slant height of 10 and radius 8}$
Solution
Exercise 297: Solution
A $240^\circ$ sector of a circle of radius $15$ is rolled up (aligning its two straight sides) to form the lateral surface of a cone. What are the cone's slant height and radius?
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