### Triangles and Polygons

Triangles and other polygons play a role in our lives everyday. We will be studying these shapes in class over the next couple of weeks. Try this crossword puzzle without any reference materials first to test your background knowledge. If you get stuck, use your textbook, computer or math dictionary to help you. Good luck! (** Note: If your answer is more than one word, do not put any spaces between words when you fill in the puzzle.)

 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Across
1.the sum total of the three angles of any triangle (2 words)
10.a triangle with at least two congruent sides (2 words)
12.a triangle with no congruent sides (2 words)
15.a parallelogram with four right angles
17.a parallelogram with congruent sides and congruent angles
18.figures that have the same size and shape
19.a polygon with six sides
20.a simple closed figure formed by three or more line segments
Down
2.a triangle with three congruent sides (2 words)
3.a polygon with four sides
4.a quadrilateral with 2 pairs of parallel sides
5.a polygon with three sides
6.a triangle with one right angle (2 words)
7.parallelogram with all congruent sides
8.a triangle with three angles that are less than 90 degrees (2 words)
9.a polygon with ten sides
11.a triangle with one angle greater than 90 degrees (2 words)
13.quadrilateral with exactly one pair of parallel sides
14.a polygon with five sides
16.a polygon with eight sides

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