A cone has base area equal to its lateral surface area. If radius = r, find slant height l.

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1. Base area = $\pi r^2$.
2. Lateral surface area = $\pi r l$.
3. Given they are equal: $\pi r^2=\pi r l$. Cancel $\pi r$ to get $r=l$.
4. So $l=r$. **Answer: (a)**
FINAL_ANSWER: a

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