Crossword Puzzle for Quadrilaterals
Special Quadrilaterals
by Reginald W. Noland, Jr.
1
2
3
4
5
9
10
12
11
13
14
15
17
20
BASEANGLES
BASES
COMPLEMENTARY
CONGRUENT
CONTRADICTION
DECAGON
24
DIAGONALS
DODECAGON
27
EXTERIOR ANGLE
WORD LIST
HEIGHT
HEXAGON
HYPOTENUSE
23
ISOSCELES TRAPEZOID
ISOSCELESTRIANGLES
KITE
LEGS
MEDIAN OF A TRIANGLE
MIDSEGMENT OF A TRAPEZOID
MIDSEGMENT OF A TRIANGLE
21
NEGATION
NONAGON
OCTAGON
OPPOSITE ANGLES
PARALLEL
25
PARALLELOGRAM
PENTAGON
28
PERPENDICULAR BISECTOR
POLYGON
QUADRILATERAL
QUINDECAGON
RECTANGLE
RHOMBUS
RIGHTANGLE
RIGHT TRIANGLES
SUPPLEMENTARY
TRAPEZOID
30
Across
2. If a point is equidistant from the endpoints of a segment, then it lies on the ____ of the
segment. (two words)
5. The MOST GENERAL parallelogram with congruent diagonals is a(n) ____.
6. Each diagonal of a rhombus bisects a pair of _____. (two words)
9. The ____ of a rhombus are always perpendicular.
10. A quadrilateral with exactly one pair of parallel sides, one pair of congruent sides, two pair of
congruent base angles, and congruent diagonals is a(n) ____. (two words)
12. Any many-angled figure with all line segments for sides is a(n) ____.
13. The ____ measures half of the base parallel to it. (four words)
14. A regular polygon each of whose exterior angles measures 72° is a(n) _____.
15. A regular polygon each of whose interior angles measures 135° is a(n) ____.
16. An indirect proof proceeds until we reach a(n) ____ of a known fact such as a given, a
definition, a theorem, a postulate, or a property of algebra.
17. The opposite angles of an isosceles trapezoid are ____.
18. A regular ____ has fifteen sides.
20. The perpendicular distance between the bases of a trapezoid or between the vertex angle and
base of a triangle (i.e. the length of the altitude) is called the ____.
21. A line segment connecting the midpoints of the legs of a quadrilateral with only one pair of
parallel sides is called the ___ . (four words)
24. In a parallelogram, both pair of opposite sides and opposite angles are ____.
28. Any polygon whose interior angles sum to 360° is a(n) _____.
29. We can know that a parallelogram is a rectangle if it has even one ____ . (two words)
30. An isosceles trapezoid has two pair of congruent ___ . (two words)
31. The parallel sides of a trapezoid are called its _____.
34. The diagonals of a rhombus form four congruent ____. (two words)
35. The diagonals of a rectangle form two pair of congruent _____. (two words)
Down
1. The line segment that connects a vertex to the midpoint of the opposite side is called a(n)
_____. (four words)
3. If a quadrilateral has one pair of sides known to be both parallel and congruent, then that
quadrilateral MUST be ____.
4. A regular polygon whose interior angles sum to 1260° is a(n) ____.
7. The ____ of a triangle must be greater than either of its remote interior angles. (two words)
8. We begin an indirect proof by temporarily assuming the ____ of the conclusion we desire to
prove.
11. The acute angles of a right triangle are always _____.
19. A regular convex polygon with twelve angles is a(n) ____.
20. The midpoint of the ____ of a right triangle is always equidistant from the three vertices.
22. Both the midsegment of a triangle and the midsegment of a trapezoid are ____ to the base.
23. A regular polygon whose sides are equal in length to the radius of the circle that
circumscribes it is a(n) ____.
25. The MOST GENERAL quadrilateral with exactly one pair of parallel sides and one pair of nonparallel sides is a(n) _____.
26. A regular convex polygon each of whose exterior angles measures 36° is a(n) ____.
27. The MOST GENERAL parallelogram with four congruent sides is a(n) ______.
32. A quadrilateral with perpendicular diagonals, one pair of congruent opposite angles, a
diagonal that bisects a pair of opposite angles, one diagonal that bisects the other diagonal,
and two pair of congruent consecutive sides, yet is still NOT a parallelogram is a(n) _____.
33. The sides of a trapezoid that are not parallel are called its _____.