MATHEMAGICA (ROUND 2)

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Across
  1. 4. No. of ways for arranging objects when not considered in order.
  2. 6. Name of mathematician who gave the mathematical constant "e".
  3. 7. SI Unit for measuring the angle made at the center of a circle by an arc whose length is equal to the radius of the circle.
  4. 8. For which geometric figure, equation x² + y² + z² = 1 holds?
Down
  1. 1. Vectors lying on the same plane are _______ vectors.
  2. 2. A matrix is not invertible if it's determinant is _______.
  3. 3. If a + bi = z, then a - bi is called as complex _______.
  4. 5. The diagram made for representing complex number using co-ordinate axes.
  5. 9. Name of the symbol φ.