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

1 Answer
Deepak G.
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#

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