self Maths Puzzle

if the diameter of the earth is taken as 8000kms,find the area of the surface

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S.A Of earth=4pir^2
=804247719.3
11 years agoHelpfull: Yes(0) No(0)

area of surface=4*pi*(r^2)=pi*(d^2)=pi*(8000^2)=64000000*pi km^2
11 years agoHelpfull: Yes(0) No(0)

self Other Question

if the radii of the circular ends of a conical bucket,which is 4cm high are 28cm and 7cm find the capacity of the bucket and also the total surface area of the bucket a conical wine glass is 1 3/4cms broad and 2cms deep what is its capacity?