Surface area of a cone?

Question

How do i find the total surface area of this cone?

http://i276.photobucket.com/albums/kk33/ihatemaths91/hat2.jpg

Answer 1

the circumference is 50.

in order to get the circumference, the formula is  pi x diameter.

divide 50 by pi [3.14] to get the diameter.

then the formula for getting the surface area of a cone is pi x radius x (radius+slant height. [which is 60])

*btw, radius is a half of a diameter.

Answer 2

Here is the summary of the information we have on the cone:

h = 60 cm

c = 50 cm

To find teh Surface area of a Cone, you must use these formula,

SA = (pi)(r)(s) + (pi)(r squared)

Where:

SA is Surface Area

pi is 3.14

r is radius

s is the slant height of the cone,

Since we still have to get the Slant Height of teh cone, use this formula;

S = square root of R squared + H squared

So, To get the Surface area, you must get the Slant Heigth first.

S = square root of R squared + H squared

S = square root of 25cm squared + 60cm squared

S = 65 cm

So, to get the Surface Area

SA = (pi)(r)(s) + (pi)(r squared)

SA = (3.14)(25cm)(65cm) + (3.14)(25cm squared)

SA = 5102.5cm + 1962.5

SA = 7065 cm

Answer 3

SA=LA+pi x radius squared.

LA=pi x raius x slanted height.