Question

Find the total surface area of cone whose diameter of the base is 14m and slant height is 25 meter.​

Answer 1

Total surface area of cone =pir(r+l)

radius= 7m

slant height= 25m

Total surface area of cone=pir(r+l)

                                              =22/7 *7*(7+25)

                                              =22/7*7*32

                                              =704m2

Answer 2

Given :

• Diameter of cone = 14m.
• Slant Height = 25

To Find :

• Total Surface Area of Cone.

Solution :

$\longmapsto\tt{Diameter=14m}$

$\longmapsto\tt{Radius=\cancel\dfrac{14}{2}=7m}$

$\longmapsto\tt{Slant\:height(l)=25m}$

Using Formula :

$\longmapsto\tt\boxed{T.S.A\:of\:Cone=\pi{r(l+r)}}$

Putting Values :

$\longmapsto\tt{\dfrac{22}{\cancel{7}}\times{\cancel{7}}(25+7)}$

$\longmapsto\tt{22\times{32}}$

$\longmapsto\tt\bold{704{m}^{2}}$

So , The Total Surface Area of Cone is 704m²...

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• C.S.A of Cone = πrl
• T.S.A of Cone = πr(l+r)
• Volume of Cone = 1/3πr²h

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