Areas related to circles and similar triangles

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Across
  1. 4. length of the line segment from the centre to any point on the circle
  2. 5. A type of similarity in which one pair of corresponding sides are proportional
  3. 7. The distance around a circle
  4. 9. two triangles are ________ when all three angles are equal and all three pairs of corresponding sides are equal
  5. 10. A type of similarity in which there are two pairs of congruent angles
Down
  1. 1. sites must be _________ (in some instance) for triangles to be similar
  2. 2. the ratio of a circle's circumstance to its diameter is
  3. 3. the type of similarity in which all three corresponding sides are proportional
  4. 6. A region bounded by a chord and a corresponding are lying between the chord's end points
  5. 8. the fixed point around which a circle is drawn