Maths

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Across
  1. 4. triangle with all three sides of different lengths.
  2. 5. The distance around a circle
  3. 7. The number of degrees in a straight angle
  4. 8. The longest side of a right-angled triangle
Down
  1. 1. A shape with four equal sides and four right angles.
  2. 2. A straight line that touches a curve at one point but doesn't cross it
  3. 3. An angle that measures less than 90 degrees
  4. 6. A number that cannot be expressed as a ratio of two integers