To estimate the value of the gold plating, you must first measure and calculate the surface area(s) that it covers. This requires working with the formulas of geometric shapes.
This link gives the formulas. If you click on "online area calculator", or use the second link below, it brings up a page where you select the specific shape (triangle, circle, etc.) that you are working with. When you do this, a small window will prompt you for data (radius, height, etc.). When these are entered, it will calculate the area.
http://math.about.com/library/blmeasurement.htm
http://math.about.com/library/weekly/aa062502a.htm
This link gives the formulas. If you click on "online area calculator", or use the second link below, it brings up a page where you select the specific shape (triangle, circle, etc.) that you are working with. When you do this, a small window will prompt you for data (radius, height, etc.). When these are entered, it will calculate the area.
http://math.about.com/library/blmeasurement.htm
http://math.about.com/library/weekly/aa062502a.htm