geometry crossword

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Across
  1. 3. triangle with 2 equal sides
  2. 8. these lines only meet once and form a right angle and go their separate ways
  3. 9. it is extremely close to the circle but it meet the circle only once
  4. 13. lines which can walk together to infinity but never intersect
  5. 14. a line or an angle which is congruent to itself
Down
  1. 1. angles which have the same relative position in parallel lines
  2. 2. they're located in the inner side of parallel lines and they are not adjacent
  3. 4. when Θ=adjacent/hypotenuse
  4. 5. angles which share common side and vertex
  5. 6. its twice of radius
  6. 7. when Θ=opposite/hypotenuse
  7. 10. angles which add up to 180°
  8. 11. angles which add up to 90°
  9. 12. angles located across each other when 2 lines intersect
  10. 15. when Θ=opposite/adjacent