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A spear is not the most appropriate tool with which to find an area.
Assuming that 3.14 is pi, then most likely you're looking for the surface area of a circle, which is pi x r2.
Surface area is an assignment of a positivereal number to a certain class of surfaces that satisfies several natural requirements. The most fundamental property of the surface area is its additivity: the area of the whole is the sum of the areas of the parts.
The most general difference is: > The formula for the surface area of anything with a curved surface and edge will involve 'pi'. > The formula for the surface area of anything with only flat surfaces and straight edges won't.
The surface area of a polyhedron can be calculated by first calculating the area of each of its polygonal surfaces and adding these together.The surface area of some curved solids (sphere, cylinder, cone) can be calculated from formula but for most curved solids are more complicated and require integration.