



 
Hi Paula, I can help you get started. I drew a crosssection of the silo. B is the midpoint of the face that rests against the side of the barn and hence the length of AB is 5 feet. I see two facts that come from the diagram. Since the AB = BC the angle BCA has measure 45^{o}. Since triangle ABC is a right triangle you can use Pythagoras theorem to find the length CA which is the radius r of the circular base of the silo. I hope this helps,  


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