maths angles

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Across
  1. 4. When the sum of the measures of two angles is 90 degrees
  2. 5. If the arms form an angle of 180 degrees between them, it is called a
  3. 7. when the sum of the measures of two angles is 180 degrees
  4. 9. A line which intersects two or more lines in a plane at distinct points
  5. 10. If the inclination between the arms is more than a right angle
  6. 11. If the arms form an angle of 90 degrees between them, it is called
  7. 12. Two lines are said to be ........... when they do not meet any point in a plane
Down
  1. 1. Two angles which have a common side and a common vertex are called
  2. 2. a part of line which has a starting point and extends infinitely in one direction
  3. 3. Two angles which are formed, opposite to each other, when two lines intersect at a common point or vertex, are called
  4. 6. A ........... is the adjacent angles where non-common sides are opposite rays
  5. 8. If the inclination between the arms is less than a right angle, it is called an