60 The curved surface area $ ( c ) $ of a cone is $ \pi r l , $ where $ 1 = $ $ \sqrt { r ^ { 2 } + h ^ { 2 } } , $ express $ h $ in terms of $ c $ and $ r $

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Mark the correct answer.

Assertion(A): The total surface area of a cone whose radius is

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60 The curved surface area \( ( c ) \) of a cone is \( \pi r l , \) where \( 1 = \) \( \sqrt { r ^ { 2 } + h ^ { 2 } } , \) express \( h \) in terms of \( c \) and \( r \)