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Give the total surface area, in terms of π, of a cone of radius 5 cm and height 12 cm.

Class 9Surface Area of a ConeMensuration

A90π $cm^{2}$
B60π $cm^{2}$
C85π $cm^{2}$
D65π $cm^{2}$

Step-by-Step Solution

l = 13

. TSA = π ×

5 \times (13 + 5) = 90

π

cm^{2}

. (65π is the curved part; 85π uses h:

5 \times 17.

)

Answer: A) 90π

cm^{2}

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