Maths Puzzle

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Across
  1. 3. Maximum number of real roots of a cubic polynomial
  2. 5. Part of the circumference of a circle
  3. 6. If discriminant of a quadratic is 0 then the roots are ____
  4. 7. Locus of a point equidistant from a fixed point
Down
  1. 1. Intersection point of the perpendicular bisectors of chords
  2. 2. Value of Sine 30 degrees
  3. 3. Minimum number of points for defining a unique line
  4. 4. Shortest distance between a line and a point