That depends on the shape of the object. For a sphere (globe or ball) the formula for its surface area is 4 x pi x r2 where pi = 3.1416 eg for a sphere of radius 3 cms the surface area = 4 x 3.1416 x 3 x 3 = 113.098 sq cms
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4 pi r 2
the equations tell you what the surface area of somthing is
its not i dont no why
length times width
you find the surface area of a circle by first finding the area of the circles/ two ends. you do this by multiplying the diameter by pi then multiply by two, that is both ends put together then you find the area of the flat part by finding out the circumference of the circle ends, then multiply that by the height of the cylinder. circumference= pi times the diameter then add all your calculation together, and you have the surface area of your cylinder :)