Mathematics crossword for class 7

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Across
  1. 4. Sum of two angles is 90 degree
  2. 6. Angle more than 90 degree
  3. 9. A regular triangle
  4. 11. Two lines in a plane which do not intersect
Down
  1. 1. A triangle having two equal sides
  2. 2. Sum of two angles is 180 degree
  3. 3. The longest side of a right- angled triangle
  4. 4. Two figures having same size and same length
  5. 5. A line intersects two parallel lines
  6. 7. A triangle with all its sides unequal
  7. 8. Angle less than 90 degree
  8. 10. Two angles having a common vertex