Question

Find the total surface area of a Cone, its slant height is 28 m
and diameter of its base is 48 m.

Answer 1

Given:

Slant height = 28m

Diameter = 48m

To find:

Total surface area of the cone.

Solution:

Radius of the cone = 48÷2

= 24m

TSA of the cone = $πr(r+l)$

$= π×24×(24+28)$

$\red{\sf{= 3,918.72m³}}$

Hence, the total surface area is 3,918.72m³ !!

Additional Information:

• $\mathtt{TSA_{(cone)} = πr(r+l)}$
• $\mathtt{CSA_{(cone)} = πrl}$
• $\mathtt{CSA_{(sphere)} = 4πr²}$
• $\mathtt{TSA_{(cylinder)} = 2πr(h + r)}$
• $\mathtt{CSA_{(cylinder)} = 2πrh²}$

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