Find the center of mass of a lamina in the shape of a quarter-circle with radius 
with density 
Definitions:
FOB
Free on Board; a contractual term indicating that the seller assumes responsibility for the goods until they are loaded onto a transport vessel.
Risk of Loss
The responsibility for damage or destruction to goods, typically determining who bears the cost when property is damaged during a transaction or transportation.
Total Loss
A situation in which property is so extensively damaged that repair is not reasonable and it's considered a complete write-off.
Document of Title
Legal documentation evidencing a person's right to the control or ownership of goods, typically used in the context of shipping or storage.
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