Looking For Pythagoras

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Across
  1. 2. Forms right angles
  2. 6. 3 sides
  3. 7. A line segment between the center & a point in a circle or sphere
  4. 8. Longest side in right-angled triangle
  5. 10. ?=L+W+L+W
Down
  1. 1. A point halfway between two given points
  2. 3. ?=Diameter x 3.14
  3. 4. ?=Length x Width
  4. 5. A line segment between two points on the circle or sphere which passes through the center
  5. 9. Sides of a right triangle that are adjacent to the right angle