Download Crossword Puzzle on Parallel Lines and Polygons

Crossword Puzzle on Parallel Lines and Polygons
Across
1. If the exterior sides of two adjacent acute angles are perpendicular, then the angles are ____.
4. The exterior angle of a triangle must be greater than each ____ ____ ____ .(3 words)
6. The number of possible diagonals from each vertex of a regular polygon is always ____ (a number) less than the
number of sides of the polygon.
8. If two of the angles in a triangle are complementary, then two of the legs of that triangle are ____ to one another.
10. If two angles are supplementary to congruent angles or to the same angle, then the original two angles are ____.
11. Lines that were not part of the original diagram but which were drawn to assist in the calculation of angle
measures are called ____ .(2 words)
14. A triangle with no two sides of equal length is called a(n) _____ triangle.
15. If two parallel lines are cut by a transversal, then angles on opposide sides of the transversal and formed outside
the parallel lines are called ____. (3 words)
17. Any four-sided closed plane figure is called a(n) ____.
18. The number of triangles formed inside a regular polygon by all possible diagonals drawn from a single vertex is
always ____ (a number) less than the number of sides of the polygon.
19. A regular polygon whose exterior angle measures 40° is a(n) _____.
23. A regular polygon whose internal angles sum to 720° is a(n) _____.
26. A triangle with three sides equal in length is a(n) ____ triangle.
28. A triangle with at least two sides of equal length is called a(n) ____ triangle.
29. The longest side of a right triangle, called its ____, is always opposite the right angle.
31. The angle opposite the base of an isosceles triangle is its ____. (2 words)
Down
1. Two angles in the same position relative to a common transversal and the parallel line on which it is formed are
called ____. (2 words)
2. The distance around a polygon is its _____.
3. If two parallel lines are cut by a transversal, then the ____(4 words) are supplementary.
5. A regular polygon whose external angles each measures 45° is a(n) ____.
7. A polygon with all congruent angles and all congruent sides is said to be _____.
8. If the alternate exterior angles of two lines cut by a transversal are congruent, then the lines must be ____.
9. A triangle with three angles, each of which measures less than 90°,is called a(n) _____ triangle.
12. A five-sided polygon is a(n) _____.
13. The measure of the _____(2 words) is equal to the sum of the two remote interior angles.
14. Two noncoplanar lines that never intersect are called ____. (2 words)
16. Another name for a regular quadrilateral is a(n) ____.
20. A line segment that connects two non-consecutive vertices of a polygon is called a(n) _____.
21. A(n) ____ triangle contains exactly one angle that measures more than 90° but less than 180°.
22. Each interior angle of a regular _____ measures 144°.
24. A many-sided closed plane figure is called a(n) ____.
25. A regular quindecagon has exactly _____ congruent angles and congruent sides.
27. An isosceles triangle with two 45° angles is also a(n) ____ triangle.
30. The largest number of right or obtuse angles possible in a triangle is exactly ____.
Word List
acute
alternate exterior angles
auxiliary lines
complementary
congruent
corresponding angles
decagon
diagonal
equilateral
exterior angle
fifteen
hexagon
hypotenuse
isosceles
nonagon
obtuse
octagon
one
parallel
pentagon
perimeter
perpendicular
polygon
quadrilateral
regular
remote interior angle
right
same side interior angles
scalene
skew lines
square
three
two
vertex angle
Parallelism
by Reginald W. Noland, Jr.
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