Criss cross school

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Across
  1. 5. Longest chord of the circle.
  2. 7. Who gave the world digit zero ?
  3. 10. Combination of two days with a common end point.
  4. 12. A 3d figure so shaped that every point on its surface is an equal distance from its center.
  5. 14. Parallelogram containing a right angle.
  6. 15. Flat and level with the ground, rather than at an angle to it
Down
  1. 1. A branch of maths that focuses on the measurement and relationship of lines, angles, surfaces, solids and points.
  2. 2. To turn an object around centre point.
  3. 3. A branch of mathematics that studies relationships between side lengths and angles of triangles.
  4. 4. Regular quadrilateral having equal sides and angles.
  5. 6. The part of mathematics that helps represent problems or situations in the form of mathematical expressions.
  6. 8. a line with respect to which a curve or figure is drawn, measured, rotated, etc
  7. 9. involving or being based on a suggested idea or theory.
  8. 11. mathematical comparison between two numbers
  9. 13. Average of a set of values.