I always medal.
Find the surface area of a cone.
(screenshot of the cone here)
http://prntscr.com/a70agj

Question

I always medal.
Find the surface area of a cone.
(screenshot of the cone here) 
http://prntscr.com/a70agj

nikki_skellington · Answer

468.23 or 468

welshfella · Answer

surface area = pi r^2 + pi r l

where r = radius of the base and l = slant height

traylea · Answer

Um...ok. Can I have an explanation ?

welshfella · Answer

r = radius of the base . radius = 1/2 * diameter which you are given ( = 8)
l = slant height of the cone = 7

Just plug these values in to the formula
use 3.14 for pi

traylea · Answer

.5*4*7?

welshfella · Answer

no 
plug the values into pi r^2 + pi r l

welshfella · Answer

r = 1/2 * 8 = 4

welshfella · Answer

just replace pi by 3.14 , r by 4 and l by 7 and work it out. Use your caclulator.

traylea · Answer

ok.....

zepdrix · Answer

|dw:1456252061967:dw|The pi*r^2 portion is what gives you the area of the circular bottom panel.