Explain why a three-dimensional figure with a curved surface is not a polyhedron.

We are given a '3-D figure with a curved surface'.

Now, we know that,

Which means that the faces of the polyhedron are 2-D closed shapes bounded by straight lines.

Since, the 3-D figure consists of curved surface and the polyhedron does not have any curved surface.

Thus, we have,

A three-dimensional figure with a curved surface is not a polyhedron.

step-by-step explanation:

given that ab is divided into equal parts as

ac, cd, de, ef, fg, gh, hi, ib.

from this we find that f is the midpoint of ab.

so using mid point formula we find

f = (3,7)

similarly considering fb, we get

h = mid point of fb = ((6,6) and g, mid point of fh is

g = (9/2, 13/2)

i is mid point of hb

so i =(15/2,11/2)