Math New Year Puzzle

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Across
  1. 4. angle The angle formed at the intersection of two lines perpendicular to one another
  2. 6. triangle The two corners of the triangle have equal degrees
  3. 8. angle A large angle that does not form a straight line but does not form vertically
  4. 10. In the division equation, the number preceding the Division
  5. 11. In the multiplication equation, multiplication the preceding number
  6. 14. In the subtraction formula,the number after the minus sign
  7. 15. triangle A triangle that is formed by intersecting three lines without a single angle
Down
  1. 1. angle The small angle at which two lines intersect without forming a straight line but not vertically
  2. 2. In the division equation, the number following the division
  3. 3. In the subtraction formula,the number before the minus sign
  4. 5. The number of the division formula that is left after the result is endless
  5. 7. triangle The angles of the triangles are 60 degrees
  6. 9. In the multiplication equation, the number behind the multiplication
  7. 12. The result of a division formula
  8. 13. angle The angle formed by a straight line on the horizontal plane