SSS, SAS, AAS,...S.O.S.

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Across
  1. 2. a^2+b^2=c^2
  2. 3. longest side of a right triangle
  3. 5. two lines meet to create right angles
  4. 6. two legs of right triangles are =
  5. 7. same shape/size/length
  6. 8. leg and angle of right triangles are =
Down
  1. 1. hyp and leg of right triangles are =
  2. 4. hyp and angle of right triangles are =