1. what is the radius of the top of the cup? explain your reasoning.

2. what is the volume of the water in the cup?

(see image)

The volume is 1071.787cm cube
so, volume of cone = pi x r x r x h / 3
                               = 3.14 x 8 x 8 x 16 / 3
                                 =3215.36 / 3
                                       =1071.8cm cube

The right answer should be 6 but your not very specific