From the picture, we want to calculate the volume of the alcohol we are using. In this case, we can see that the shape that the alcohol takes is the shape of a cylinder.
We can see that since the alcohol is contained in the beaker, the alcohol cylinder would have the same radius as the beaker.Note that the beaker has a diameter of 1 cm. So the radius of the beaker would be the diameter divided by 2, that is 0.5 cm. Also, note that the height of the cylinder would be 5 cm.
Now, recall that the volume of a cylinder is given by the formula
Then, in our case we have h=5 and r=0.5. So we have the formula
which would be the volume of the alcohol to be used.