Aplane is a set of on a flat surface that extends forever
a. segments.
b. lines.
c. other planes.
d. none of the above

D.

Step-by-step explanation:

None of the above because I believe that it is points

80π/3 or about 83.775

step-by-step explanation:

since a cone is 1/3 of a cylinder, we need to find the base's area. since area = πr^2, we get 16π. then, multiplying this by 5, we get 80π. dividing by 3, since the cone's volume is 1/3 of that of a cylinder's, we get 80π/3.

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