A right circular cone has a radius of 9 cm and a height of 40 cm. What is its slant height?

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Accepted Answer

1. In a right cone, slant height $l$ satisfies the Pythagorean relation $l^2=r^2+h^2$.
2. Substitute $r=9$ and $h=40$: $l^2=9^2+40^2=81+1600=1681$.
3. So $l=\sqrt{1681}=41$ cm. **Answer: (a) 41 cm.**
FINAL_ANSWER: a

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