Matthew made a wooden cube that has an edge length of 9 inches. He painted half the faces of the cube red and the remaining faces yellow. What is the surface area of the faces Matthew painted red?
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There are six equal faces. Each face will have area of 9 x 9 = 81 square inches. If half of the faces (so 3 faces) are red, then the total surface area painted red is 3 x 81 = 243 square inches.
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