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31
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Across 1. A rhombus with four right angles 4. The side of a right angle triangle which is opposite to the right angle 8. The point of intersection of the angle bisectors of a triangle 11. A triangle with three equal sides 12. An angle between 0 and 90 degrees 13. The distance around a circle 14. A two-dimensional closed figure whose sides are line segments 19. Making an angle of 90 degrees 20. An angle between 180 and 360 degrees 22. Having the same size and shape 23. An angle of 180 degrees 24. A quadrilateral with two pairs of opposite sides equal 29. A circle that passes through all vertices of a polygon 30. A line segment joining two points of a curve 31. To divide into two equal parts 32. Having the same distance 33. A polygon in which no sides are equal in length 34. A chord of a circle which passes through the centre

Down 1. Having corresponding sides in proportion and corresponding angles equal 2. Two angles whose sum is 180 degrees 3. A line segment from drawn from a vertex of a triangle to the midpoint of the opposite side 5. A quadrilateral with opposite sides parallel 6. The point at which two sides of a polygon meet 7. The point of intersection of the altitudes of a triangle 9. The point of intersection of the medians of a triangle 10. What the seed said when it grew up (joke) 13. Two angles whose sum is 90 degtrees 15. An angle between 90 and 180 degrees 16. A line or a curve which touches but does not cross another line or curve at a point within a given interval 17. The point of intersection of the three right bisectors of a triangle 18. An angle of 360 degrees 21. A triangle with at least two equal sides 25. The inscribed circle of a triangle 26. A quadrilateral with all sides equal in length 27. The father of deductive geometry 28. A quadrilateral with four right angles