What is the surface area of a cone with a slant of 9 cm and a height of 7 cm?

1 Answer
Aug 13, 2016

=260.47cm^2

Explanation:

r=sqrt(l^2-h^2) where l=slant=9 and h=height=7 and r= radius of a Cone
or
r=sqrt(9^2-7^2)
or
r=sqrt(81-49)
or
r=sqrt(32)
or
r=5.66
Surface Area of a Cone =pir(r+l)=pitimes5.66times(5.66+9)=260.47 cm^2