If h, C and V respectively represent the height, curved surface area and volume of a cone, prove

Class - 10 | CBSE I Mathematics

Question : If h, C and V respectively represent the height, curved surface area and volume of a cone, prove that : C^2 = 3𝜋Vh^3 + 9 V^2 / h^2.

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[srilakshmiii]

Sir, I'm having a doubt in this question, Why didn't we multiply pi with all the numbers? We didn't multiply pi with r2?