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A birthday cap is a cone of radius 5 cm and height 12 cm. How much paper is needed for one cap? (π = 3.14)

Class 9Surface Area of a ConeMensuration

A $204.1 cm^{2}$
B $282.6 cm^{2}$
C $188.4 cm^{2}$
D $102.05 cm^{2}$

Step-by-Step Solution

l

= √

(25 + 144) = 13

cm. Paper = CSA =

3.14 \times 5 \times 13 = 204.1 cm^{2}

. (188.4 uses

h = 12

; 282.6 adds a base the cap does not have.)

Answer: A)

204.1 cm^{2}

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