Question

find the curve surface area of a cone with a vertical height of 8cm and radius of 6cm​

Answer 1

Answer:

first finding slant height

Step-by-step explanation:

may be right

Answer 2

Answer:

$\bullet\:\:\textsf{Radius of the cone = \textbf{6 cm}}$

$\bullet\:\:\textsf{Height of the cone = \textbf{8 cm}}$

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☯ $\underline{\boldsymbol{According\: to \:the\: Question\:now :}}$

$\sf \bigstar \:\: Slant \: height \:(l) = \sqrt{r^2 + h^2}\:\:\bigstar$

$:\implies \sf Slant \: height = \sqrt{(6)^2 + (8)^2}$

$:\implies \sf Slant \: height = \sqrt{36+ 64}$

$:\implies \sf Slant \: height = \sqrt{100}$

$:\implies \underline{ \boxed{ \sf Slant \: height = 10 \: cm}}$

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$\sf \bigstar \:\: CSA \: of \:cone = \pi rl\:\:\bigstar$

$\sf \dashrightarrow \:\: CSA \: of \:cone = \dfrac{22}{7} \times 6 \times 10$

$\sf \dashrightarrow \:\: CSA \: of \:cone = \dfrac{1320}{7}$

$\dashrightarrow \underline{ \boxed{ \sf \:\: CSA \: of \:cone = 188.57 \: {cm}^{2} }}$