India's maths words

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Across
  1. 4. all sides and angles are different in a ...... triangle.
  2. 5. angles that make a C shape.
  3. 7. a line that touches a circle.
  4. 8. angles in a ...... add up to 720 degrees.
Down
  1. 1. an angle more than 180 degrees but less than 360 degrees.
  2. 2. Angles in a ...... add up to 180 degrees.
  3. 3. angles that make an F shape.
  4. 4. When a letter replaces a number.
  5. 6. all exterior angles of ...... add up to 360 degrees.