Eight sided dice can be described as two square based pyramids stuck together at the bases. their faces are equilateral triangles. if the edge of one die is 2 mm, find the difference in materials cost between a solid gold die and a "gold" painted plastic die.
gold costs $40.38 per gra. gold weighs .02 grams per cubic mm. plastic costs $10 per gram. plastic weighs .01 grams per cubic mm. "gold" paint costs $.01 per square mm.