Hi there!Find the tsa of the cone, if it's slant height is 21m diamete

1.	Hi there!Find the tsa of the cone, if it's slant height is 21m diameter of its base is 24m.▬▬▬▬▬▬▬▬▬▬Thanks! :D
Answer» GIVEN : Slant height of cone = 21m And diameter of its base = 24 m So, the RADIUS = 24/2 = 12 m TO FIND : The TOTAL surface area of the cone = ? SOLUTION : ★ TSA of cone = πr (r + l) ➨ TSA of cone = 22/7 × 12 × (12 + 21) ➨ TSA of cone = 22/7 × 12 × 33 ➨ TSA of cone = 22/7 × 396 ➨ TSA of cone = 1244.57 m² Hence, the total surface area of cone is 1244.57 m². $\rule{200}3$ $\boxed{\begin{minipage}{6 cm}\bigstar$\:\underline{\textbf{Formulae Related to Cone :}}\\\\\sf {\textcircled{\footnotesize\textsf{1}}} \:Area\:of\:Base =\pi r^2 \\\\ \sf {\textcircled{\footnotesize\textsf{2}}} \:\:CSA = \pi rl\\\\\sf{\textcircled{\footnotesize\textsf{3}}} \:\:TSA = Area\:of\:Base + CSA\\{\quad\:\:\:\qquad=\pi r^2+\pi rl}\\ \\{\textcircled{\footnotesize\textsf{4}}} \: \:Volume=\dfrac{1}{3}\pi r^2h\end{minipage}}$ $\rule{200}3$

Hi there!Find the tsa of the cone, if it's slant height is 21m diameter of its base is 24m.▬▬▬▬▬▬▬▬▬▬Thanks! :D

Answer»

GIVEN :

Slant height of cone = 21m

And diameter of its base = 24 m

So, the RADIUS = 24/2 = 12 m

TO FIND :

The TOTAL surface area of the cone = ?

SOLUTION :

★ TSA of cone = πr (r + l)

➨ TSA of cone = 22/7 × 12 × (12 + 21)

➨ TSA of cone = 22/7 × 12 × 33

➨ TSA of cone = 22/7 × 396

➨ TSA of cone = 1244.57 m²

Hence, the total surface area of cone is 1244.57 m².

$\rule{200}3$

$\boxed{\begin{minipage}{6 cm}\bigstar$\:\underline{\textbf{Formulae Related to Cone :}}\\\\\sf {\textcircled{\footnotesize\textsf{1}}} \:Area\:of\:Base =\pi r^2 \\\\ \sf {\textcircled{\footnotesize\textsf{2}}} \:\:CSA = \pi rl\\\\\sf{\textcircled{\footnotesize\textsf{3}}} \:\:TSA = Area\:of\:Base + CSA\\{\quad\:\:\:\qquad=\pi r^2+\pi rl}\\ \\{\textcircled{\footnotesize\textsf{4}}} \: \:Volume=\dfrac{1}{3}\pi r^2h\end{minipage}}$

$\rule{200}3$