Trivia Answer

Yesterday's trivia question was, "What is the shape of the Washington Monument?"

  aikakone got the answer correct.

 The shape of the Washington Monument is an obelisk.

 Merriam-Webster defines it as, "an upright 4-sided usually monolithic pillar that gradually tapers as it rises and terminates in a pyramid."

 This would basically be a really thin trapezoidal prism (or however many make up the long pillar) and then a rectangular pyramid on the top.