Sloving Terminologies & Basic Geometrical Figures

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Across
  1. 2. You check something to see it's true or accurate.
  2. 6. A quadrilateral with four equal lengths sides and four acute angles.
  3. 7. A triangle poses three sides with different lengths.
  4. 8. You need to show it to be true.
  5. 10. A quadrilateral which only has a pair of parallel lines.
  6. 11. To tell others about something in a easy way.
  7. 12. It means to calculate something exactly.
  8. 14. A triangle poses three sides with same lengths.
Down
  1. 1. People now can use computer or phone to do it without abacus.
  2. 3. Two sides in a triangle have the same length.
  3. 4. A triangle with a right angle.
  4. 5. A two-dimensional shape with four sides.
  5. 7. To make something clear.
  6. 8. Four sides are not equal, only the opposite sides being parallel and equal to each other.
  7. 9. It means to estimate the value of something.
  8. 13. Giving a good explanation for doing something.