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To calculate the surface area of a rectangular prism, you need to find the area of each of the six faces and then add them together.
The formula for the surface area of a rectangular prism is:
Surface Area = 2lw + 2lh + 2wh
Plugging in the values given:
Surface Area = 2(6.5 x 1.5) + 2(6.5 x 1) + 2(1.5 x 1)
Surface Area = 2(9.75) + 2(6.5) + 2(1.5)
Surface Area = 19.5 + 13 + 3
Surface Area = 35.5 square inches
So, the surface area of each granola bar is 35.5 square inches. This is the amount of chocolate needed to cover each granola bar with a thin layer.