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a. In 3D, this figure would be a rectangular prism with dimensions 6 cm x 3 cm x 3 cm. Unwrapping the figure, we would have a rectangle with dimensions 6 cm x 3 cm and another rectangle with dimensions 6 cm x 3 cm.
b. In 3D, this figure would be a rectangular prism with dimensions 3 in. x 10 in. x 3 in. Unwrapping the figure, we would have a rectangle with dimensions 3 in. x 10 in. and another rectangle with dimensions 3 in. x 10 in.