10. CU DEEPER Which polygons in the floor plan have four equal sides and
four congruent angles? How many of these polygons are there?

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Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30