revision with 2d shapes 1

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Across
  1. 3. always used with circles it is equal to 3.14 or 22/7. Normally we use this symbol π.(2)
  2. 5. adding all the edges of a polygon (9)
  3. 6. a shape with 4 sides (13)
  4. 7. the outline of the circle (13)
  5. 10. half the diameter (6)
  6. 12. the circumference is to the circle as the ____________ is to the square.(9)
  7. 15. a straight line joining two opposite corners of a square, rectangle.(8)
  8. 17. any 2d shape with straight edges (7)
  9. 18. we use this formula to find the circumference given the radius of a circle (3)
Down
  1. 1. an angle that is smaller than 90 degrees (5)
  2. 2. it is double the radius (8)
  3. 4. with πr^2 we get the area of a ______________.(6)
  4. 5. the height that is always used to find the area of a triangle.(13)
  5. 8. an angle of 90 degrees is called a ________ angle.(5)
  6. 9. length x breadth in a rectangle (4)
  7. 11. an angle that is greater than 90 degrees but smaller than 180 degrees (6)
  8. 13. 1/2 base x height gives the area of a ______________. (8)
  9. 14. we use this formula to find the circumference given the diameter of a circle (2)
  10. 16. the point that is exactly in the middle of the circle (6)