Maths Crossword

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Across
  1. 3. 22/7 is the value of ________
  2. 6. Unique number neither prime nor composite
  3. 7. Increases the value
  4. 11. Perimeter of a rectangle with sides 12cm & 180cm
  5. 12. The only even prime number
  6. 13. Number of sides of a heptagon
  7. 15. All sides are equal & has 90 at the vertices
  8. 16. Square root of 80*5
  9. 17. Half of 180 minus 30
Down
  1. 1. the longest side of a right-angled triangle, opposite the right angle
  2. 2. Space occupied by an object
  3. 4. ________ symbol stands for _________
  4. 5. (((72/4+7)*3)-19)
  5. 8. Angle is formed at ________
  6. 9. Sum of 2 digits is 8 & both digits are prime numbers
  7. 10. A figure with 1 curved and 1 flat surface
  8. 14. Measure of bisected angle of a straight line