Rounding to the nearest tenth does not make sense as the other numbers only have precision to the nearest whole number. Had they been reported as R = 6.0 m and h = 17.0 m, MAYBE asking to the nearest tenth would be reasonable. To be very precise, asking to the nearest tenth means the results have four significant digits and the dimensions and π should have been reported as R = 6.000 m, h = 17.00 m and π = 3.142
It must pass the vertical line test. That is it must not have any vertical line passing through more than one point on the curve. If it does then it is not a function.
Thus , for example, a circle graph would not be a function.
