To find a volume you usually need to multiply values together.
When working with mixed numbers it is usually easier to convert them into improper fractions, do the calculations and convert any resulting improper fraction into a mixed number.
So you don't need to use either format, it's just that improper fractions are easier to manipulate.
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the same way you always multiply fractions. Change mixed numbers into improper fractions, multiply all numerators to get a new numerator, multiply all denominators to get a new denominator, then reduce the fraction.
Because the formula is the same: volume = 1/3base areaheight
Some of the many applications that pi is used in geometry are as follows:- Finding the area of a circle Finding the circumference of a circle Finding the volume of a sphere Finding the surface area of a sphere Finding the surface area and volume of a cylinder Finding the volume of a cone
There is no formula for this. You have to measure the volume.
Finding volume is working in three dimensions while finding area is only working in two dimensions. Essentially, finding volume and area are the same basic principles, just volume has an additional component. For example, the area of a square is length*width, while the volume of a cube is length*width*height. Eventually things progress to the "calculus-state" and become much more complicated.