SHAPES, SPACE AND PATTERNS

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Across
  1. 3. DOUBLE OF RADIUS
  2. 5. INSTRUMENT USED TO DRAW A CIRCLE
  3. 7. DIAMETER IS ...... OF RADIUS
  4. 8. LENGTH OF A CIRCLE
  5. 9. NUMBER OF SIDES IN A TRIANGLE
  6. 10. A A QUADRILATERAL WITH ALL ANGLES 90 DEGREE AND ALL SIDES EQUAL
  7. 11. HALF OF DIAMETER
  8. 12. A SQUARE IS A QUADRILATERAL. TRUE/FAKE
Down
  1. 1. SHAPE OF A WHEEL
  2. 2. A QUADRILATERAL WITH ALL ANGLES 90 DEGREE
  3. 4. A 4 SIDED POLYGON
  4. 6. ALL RADII OF A CIRCLE MEET AT THE CENTRE. TRUE/FAKE
  5. 7. FOUR 3,6,9,???,15,18
  6. 9. DIAMETER OF A CIRCLE IS RADIUS IS 15 IS..?