Please find attached spreadsheet that provides an illustration for calculation the are of a cone.
I have provided some assumptions for known values... in the event other values are required, the assumption is that those values are also known or can be obtained.
The triangles are not drawn to scale... scale is not really important at this moment though.
My questions... based on the calculation of the two triangles (at intersection), how can the area for the large "red cone" be calculated?
The final shape for calculation 2b is a trapezoid.
What is the distance from the point of intersection to right side of the figure?
What determines it? Is it a fixed range. or something else?
You may be able to find all the distances (and all the areas) from similar triangles.