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You've got the context wrong; the diameter is a line passing from side to side through the centre of a circle or sphere. So I can't answer you.
-8
It depends on what the 25 cm is - the side, perimeter, diagonal, etc. 25 cm cannot be the area because the units are wrong.
11 = 1
If you mean x/5 = (1/5)x then yes (the x is in line with the fraction bar). If you mean x/5 = 1/(5x) then no (because the x is in the denominator on the right side and in the numerator on the left side).