Cos a/2= square root 1-cos a/2 for all values of a.

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What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges

Someone answer this asap for the length, in feet, of a rectangular rug is represented by the expression 5x² + 2x. the width, in feet, is represented by the expression 3x². which expression represents the perimeter, in feet, of the rug? a. 8x² + 2x b. 8x² + 4x c. 16x² + 2x d. 16x² + 4x