Pythagorean theorem crossword puzzle

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Across
  1. 3. A branch of mathematics that studies sizes, shapes, positions and angles.
  2. 5. The two legs of a right triangle are ___
  3. 7. Who invented the Pythagorean theorem?
  4. 9. A closed shape with three straight sides.
  5. 10. How many degrees are there in a right angle?
Down
  1. 1. A statement that can be proven to be true by formulas and arguments.
  2. 2. a2+b2=c2 is a ___
  3. 4. The longest side of a right triangle.
  4. 6. On which triangle does the Pythagorean theorem work on?
  5. 8. Result of multiplying a number by itself.