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

1. 41 cm
2. 42 cm
3. 43 cm
4. 45 cm

Correct answer: 41 cm

Solution

In a right circular cone, the slant height $l$ is found using $l^2=r^2+h^2$. Substituting $r=9$ cm and $h=40$ cm gives $l^2=81+1600=1681$. Therefore, $l=41$ cm.

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