Maths Puzzle

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Across
  1. 2. Top view of a dice
  2. 5. Point of concurrency of altitude
  3. 8. Solution of a Linear Equation in Two variables
Down
  1. 1. Largest chord of a circle
  2. 3. Minimum value of a perfect square
  3. 4. Point of concurrency of median
  4. 5. Every number of the form 2n+1 is
  5. 6. The maximum number of real roots of a quadratic
  6. 7. Locus of point equidistant from a fixed point