Three dimensional objects, such as a cone, do not have a perimeter in any meaningful way.
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The formula to find the perimeter of a cone is not commonly used, as the perimeter is typically associated with two-dimensional shapes like circles and polygons. However, if we consider the base of the cone as a circle, the perimeter would be the circumference of the base circle. The formula for the circumference of a circle is 2πr, where r is the radius of the circle. So, the perimeter of a cone would be 2π times the radius of the base circle.
Pi is used to find the area and perimeter of a circle and the volume of a sphere, cylinder, and cone. Pi=3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223172535940812848111745028410270193852110555964462294895493038196... That was 200 decimal places of Pi.
If you know the perimeter, there is no need to find it again.
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!
you find the radius of a cone by the bottom of it or the round part