A) \[\sqrt{{{r}^{2}}+{{h}^{2}}}\]
B) \[r\sqrt{5}\]
C) \[h\sqrt{5}\]
D) \[rh\sqrt{5}\]
Correct Answer: B
Solution :
Let radius of the cone = r \[\therefore \]Height of the cone (h) = diameter = 2r \[\therefore \]Slant height of the cone\[(l)=\sqrt{{{h}^{2}}+{{r}^{2}}}\] \[=\sqrt{{{(2r)}^{2}}+{{r}^{2}}}=\sqrt{5{{r}^{2}}}=\sqrt{5}r\]
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