To find the surface area of any shape, you have to find the area of each side on the shape and then add them all up together: Base: 8*8 = 64 Height(the triangle part) : 8*9 = 72 72/2 = 36 (Because equation to find area of a triangle is b*h/2) So there are 4 of those triangle sides so you would do: 36+36+36+36 = 144
Then you add both sides together (base and height) : 64 + 144 = 208
So one coat uses 125 chinchillas . So, 10 * 125 will give you how many will give you 1250 chinchillas.. this is the number of chinchillas needed for 10 coats. So for 2 years you would have to multiply it by two so, 1250 * 2 = 2500.
