First we will find the volume of the whole cup (cone) and then find the volume of water in it to determine what fraction of the cup is full.
Volume of cone:
Formula:
V = 1/3 pi x r2 x h
Volume of cup:
V = 1/3 x 3.14 x 32 x 8
V = 75.36 cubic inches
Volume of water:
V = 1/3 x 3.14 x 32 x 4
V = 37.68 cubic inches
Fraction of cup occupied by water:
Volume of water
Volume of cup
= 37.68/75.36
= 0.5
= 1/2
Therefore, the cup is 1/2 full of water.
Volume of cone:
Formula:
V = 1/3 pi x r2 x h
Volume of cup:
V = 1/3 x 3.14 x 32 x 8
V = 75.36 cubic inches
Volume of water:
V = 1/3 x 3.14 x 32 x 4
V = 37.68 cubic inches
Fraction of cup occupied by water:
Volume of water
Volume of cup
= 37.68/75.36
= 0.5
= 1/2
Therefore, the cup is 1/2 full of water.