Hard to understand.

"Equilateral triangel is for the axis segment to the cone-shaped part"

I understand that means if 2R is the diameter of the cone, then 2R is also the length of the slanting side of the cone.

How about

"...the tower axis segment perimeter is 90 meters" ?

I assume the radius, R, of the cylinder is the same as the radius of the cone.

If the height of the cylinder is h, does it mean that

6R +2h = 90 ? ------silhouette or outline of the whole tower.

Or, 4R +2h = 90 ? -------silhouette of the cylinder only.

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I will come back after about 14 hours from now. Got to go to work.