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in this example we're asked to find the

volume of the Gibbons sphere to find the

volume of a sphere we use the formula

volume equals 4/3 times pi times radius

cubed so here since the radius is three

inches we can plug three inches in for

the radius in our formula and we have

4/3 times pi times three inches cubed

remember that three inches cubed is the

same thing as three inches times three

inches times three inches which equals

27 inches cubed and we have 4/3 pi times

27 inches cubed next notice that the 27

and three cross cancel two 9 and one and

we have 4 times pi times 9 inches cubed

which simplifies to 36 PI inches cubed

so one way to write the volume of the

given sphere is 36 PI cubic inches next

remember that pi is approximately equal

to 3.14 so we can plug 3.14 and 4 pi and

we have 36 times 3.14 inches cubed which

equals 113 point 0 4 inches cubed so

another way to write the volume of the

given sphere is 113 point 0 4 cubic

inches so remember this formula for the

volume of a sphere 4/3 pi times the

radius cubed