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The nose of a model rocket is a cone of radius 3 cm and height 4 cm. Express its curved surface area in terms of π.

Class 9Surface Area of a ConeMensuration

A21π $cm^{2}$
B24π $cm^{2}$
C15π $cm^{2}$
D12π $cm^{2}$

Step-by-Step Solution

l

= √

(9 + 16) = 5

cm. CSA = π ×

3 \times 5 = 15

π

cm^{2}

. (12π uses h; 24π is the total surface area.)

Answer: C) 15π

cm^{2}

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