Cavalieri's principle states that if two solids of equal height
have equal cross-sectional areas at every level parallel to
the respective bases, then the two solids have equal
volume.
Therefore, the formula for the volume of the sphere can
derived by writing an expression that represents the
volume of
The two shaded solids both have a height of 2r units. At
every level, the areas of the cross sections of both solids
equal (r? - b?).
one cone within the cylinder
the two cones within the cylinder,
the solid between the two cones and the cylinder,
the cylinder
X
Cross section area -
-
-
(2-0)
Cross section area -
-
)

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step-by-step explanation:

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

"image"

step-by-step explanation:

in most of these problems, the notation is that the point with a "prime" is the image of the point without. that is, b' is the image of b.

here, there is no dilation or reflection. there is simply translation (with no direction shown). which figure you call the "preimage" and which one you call the "image" is up to you. as a matter of convention, the naming is as described above.

3

step-by-step explanation: