In mathematics, what is an accepted statement of fact that is used to prove other statements?

this is not the answer this is just a question. is this middle school math?

step-by-step explanation:

for this case we have that by definition, the volume of a cylinder is given by:

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d