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OpenStudy (anonymous):
Find the surface area of the cone to the nearest whole unit.
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OpenStudy (anonymous):
sammixboo (sammixboo):
Do you know the formula to find the SA (Surface Area) of a cone?
OpenStudy (anonymous):
umm.. SA = pi-r^2 + pi-rl
OpenStudy (anonymous):
(technically theres no dash between pi and r but just so it's not confusing)
sammixboo (sammixboo):
Right! pi = 3.14 so we can plug that in SA = 3.14r^2 + 3.14rl
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sammixboo (sammixboo):
R = Radius L = Slant Height Can you tell me the radius (half of diameter) and slant height of this cone is?
OpenStudy (anonymous):
4 and 7?
sammixboo (sammixboo):
Right! So R = 4 and L = 7 Plug it is SA = 3.14*4^2 + 3,14*4*7
OpenStudy (anonymous):
50.24 + 87.92 = 138.16 so 138. Thank you so much!
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