If the radius and height of a right circular cone are \( r \) and \( h \) respectively, the ...

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If the radius and height of a right circular cone are \( r \) and \( h \) respectively, the slant height of the cone is
a. \( \left(h^{2}+r^{2}\right)^{1 / 3} \)
b. \( (h+r)^{1 / 3} \)
c. \( \left(h^{2}+r^{2}\right)^{1 / 2} \)
d. \( \left(h^{2}+r^{2}\right) \)
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