Mathematics

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Across
  1. 3. an ideal 2D figure
  2. 6. it is the ratio of the length of the side that is opposite that angle to the hypotenuse
  3. 7. There are two braches of geometry:stereometry and...
  4. 8. ...is a branch of mathematics that studies relationships involving lengths and angles of triangles
  5. 9. ... is the study of mathematical symbols and the rules for manipulating these symbols
Down
  1. 1. 3D square
  2. 2. is the part of the quadratic formula that equals b^2-4ac
  3. 4. C/0=...
  4. 5. ... is the inverse operation to exponentiation.
  5. 7. a mathematician, in honor of whom the theory of the right triangles was called