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A right cone has a radius of 13 cm and a slant height of 20 cm. Find its surface area.

Question 12 options:



A)

10,618.6 cm2



B)

816.8 cm2



C)

1,347.7 cm2



D)

3,539.5 cm2

Sagot :

Answer:

[tex]A=1347.7\ cm^2[/tex]

Step-by-step explanation:

Given that,

Radius of a cone, r = 13 cm

Slant height of the cone, l = 20 cm

We need to find the surface area of the cone. The formula for the surface area of the cone is given by :

[tex]A=\pi rl +\pi r^2[/tex]

Put all the values,

[tex]A=\pi r(l + r)\\\\A=\pi \times 13(20 + 13)\\\\A=1347.7\ cm^2[/tex]

So, the surface area of the cone is [tex]1347.7\ cm^2[/tex].

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