Quadrilateral Puzzle

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Across
  1. 2. Bisect is a verb that means to cut or divide something into two equal or nearly equal parts1234. The word comes from Latin, where bi means "two" and secare means "to cut"5. Bisect can be used in mathematics, geometry, or everyday situations125.
  2. 5. Geometry meaning is the study of shapes, sizes, angles, and positions of things in maths or real life123. Geometry is one of the oldest branches of mathematics that comes from Ancient Greek words for 'land measurement'45. A person who works in geometry is called a geometer4.
  3. 6. is a four-sided shape where all sides have equal length (marked "s").
  4. 9. a polygon with 2 sides
  5. 11. The word 'congruent' means 'exactly equal' in terms of shape and size. Even when we turn, flip, or rotate the shapes, they remain equal. For example, draw two circles of the same radius, then cut them out and place them o
  6. 13. The words analogous and similar are common synonyms of parallel. While all three words mean "closely resembling each other," parallel suggests a marked likeness in the development of two things.
  7. 14. (called a trapezoid in the UK) is a quadrilateral with NO parallel sides:
Down
  1. 1. Supplementary means added or serving as a supplement, which is something that is provided, needed, or asked for in addition to something else123. Supplementary can also refer to a supplement itself, or to a supplementary angle, which is an angle that adds up to 180 degrees with another angle14. Supplementary can also mean functioning in a supporting capacity or being of second rank or importance or value5
  2. 3. has opposite sides parallel and equal in length. Also opposite angles are equal (angles "A" are the same, and angles "B" are the same
  3. 4. is a four-sided shape where every angle is a right angle (90°).
  4. 7. has equal sides (marked "s") and every angle is a right angle (90°)
  5. 8. Each pair is made of two equal-length sides that join up.
  6. 10. when two sides cross over, we call it a "Complex" or "Self-Intersecting" quadrilateral, like these:
  7. 12. all sides equal and all angles equal) quadrilateral is a square. So all other quadrilaterals are irregular.
  8. 13. A quadrilateral is a polygon. In fact it is a 4-sided polygon, just like a triangle is a 3-sided polygon, a pentagon is a 5-sided polygon, and so on.