what is the total surface area of the cone

**gilzean** · February 10th 2009, 10:33 AM

here is the link to the cone question can you answer it and show how.

IMG_1368.jpg picture by BradCelt - Photobucket

Mr F edit: This is a duplicate question also asked here: http://www.mathhelpforum.com/math-he...area-cone.html

**masters** · February 10th 2009, 10:44 AM

Originally Posted by gilzean

here is the link to the cone question can you answer it and show how.

IMG_1368.jpg picture by BradCelt - Photobucket

Hi gilzean,

This is just a "plug and chug" formula problem. The formula for the Surface Area of a cone is:

$S.A.=\pi rs + \pi r^2$ , where

r = radius of cone

s = slant height of cone

If you don't need the area of the base of the cone, then don't add the $\pi r^2$

**gilzean** · February 10th 2009, 10:48 AM

i dont understand , radius = 10cm slant height= 15cm

total surface area = ????? ??? please???

**masters** · February 10th 2009, 11:02 AM

Originally Posted by gilzean

i dont understand , radius = 10cm slant height= 15cm

total surface area = ????? ??? please???

Substitute and solve.

$S.A.=\pi rs + \pi r^2$ , where

r = radius of cone

s = slant height of cone

$S.A=\pi (10)(15)+\pi(10^2)$

$S.A.=150 \pi + 100 \pi$

$S.A.=250 \pi$

$S.A. \approx 785.4 cm^2$

**gilzean** · February 10th 2009, 11:04 AM

says give your answer as a multiple of pie????

**masters** · February 10th 2009, 11:27 AM

Originally Posted by gilzean

says give your answer as a multiple of pie????

Then leave it as $S.A.=250 \pi$

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