The height of a cone is 12 cm. and its radius is 5 cm. then the slant height of cone is in cm.
The height of a cone is 12 cm. and its radius is 5 cm. then the slant height of cone is in cm.
A) 13
B) 17
C) 7
D) 12
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Correct option is (A) 13
h = 12 cm, r = 5 cm
\(l=\sqrt{r^2+h^2}=\sqrt{5^2+12^2}\)
\(=\sqrt{25+144}=\sqrt{169}\) = 13 cm
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