revision with 2d shapes 1

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