find the ratio between whole surfaces of a sphere and a hemisphere ?

• 4/3
  
  The surface area of a sphere of radius r = 4 π r²
  So the surface area of a hemisphere with same radius = (4 π r²)/2 + π r² = 3 π r²
  Therefore the ratio between whole surfaces of a sphere and a hemisphere = (4 π r²)/(3 π r²) = 4/3
• 6 years agoHelpfull: Yes(0) No(0)