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Question:

the top of a silo has the shape of a hemisphere of dimeter 20 ft and it is coated uiformly with a layer of ice

you guys help me to draw the picture of this exerice thanks a a lot

Answer:

Hemisphere, or half a sphere, would cover the top of a cylinder. The diameter is 20ft, or 10ft for the radius. Using the equation for the surface area of a sphere, then dividing in half for the hemisphere, you will find the surface area of the ice.
*Go through the following link deeply and see the figure

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