Three, Four, Five

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Across
  1. 5. a flat shape that has four sides and four angles
  2. 6. a series of three novels, movies, etc that are closely related and involve the same characters or themes
  3. 8. a fishing spear that has three points and that looks like a large fork
  4. 9. a shape that is like a star with five points formed by five straight lines
Down
  1. 1. a period of three months; one of three periods into which a school year is sometimes divided
  2. 2. a long distance race that has three parts, swimming, bicycling and running
  3. 3. a flat shape that has five sides and five corners
  4. 4. a group of four singers or musicians who perform together
  5. 5. one of five babies that are born at the same time to the same mother
  6. 7. a US customary unit of measurement for liquids; 4 quarts = a gallon