math

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Across
  1. 2. a straght line from the center to the curcumfrence
  2. 6. the middle point in a circle
  3. 7. each of the pairs of opposite angles made by two intersecting lines.
  4. 9. made up of various parts or elements.
  5. 10. either of two angles whose sum is 180°.
  6. 11. a math concept that measures the total length around the outside of a shape
  7. 12. two angles that are side by side and share a common vertex and a common side
Down
  1. 1. any straight line segment that passes through the centre of the circle
  2. 3. half of a circle
  3. 4. the measure of a region's size on a surface
  4. 5. he enclosing boundary of a curved geometric figure, especially a circle.
  5. 8. either of two angles whose sum is 90°.