# Polygon Vocabulary Puzzles

Our Polygon Vocabulary Puzzles are a great way to hone students’ math vocabulary skills. Our new puzzles do NOT require any Java applets. We have crosswords puzzles with three levels of difficulty, and our newly-added polygon word search. All resources are interactive, engaging, and include a timer. Solutions are also provided. Choose a puzzle below to get started. Be sure to try our related activities, too!

Polygon Crosswords |
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Polygon Word Search |
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Related Polygon Activities |

Unit on Perimeter and Area |

Perimeter and Area Worksheets |

Featured Polygon Vocabulary Words

**Angle** – In geometry, an angle is formed by two rays or line segments that share a common endpoint called the vertex. Angles are typically measured in degrees or radians, and they can be classified based on their measure as acute, obtuse, right, straight, or reflex.

**Apex **– The apex of a polygon is the highest or topmost point of the shape. For polygons such as triangles or pyramids, the apex typically refers to the vertex opposite the base or the point where all sides converge.

**Area **– The area of a polygon is the measure of the space enclosed by its sides. It is typically calculated using formulas specific to each polygon type, such as the area of a triangle (1/2 bh) or the area of a rectangle (A = lw).

**Convex** – A convex polygon is a polygon in which all interior angles are less than 180 degrees. In other words, no line segment joining two points inside the polygon goes outside the polygon.

**Diagonal** – A diagonal of a polygon is a line segment connecting two non-adjacent vertices. In polygons like quadrilaterals, diagonals connect opposite vertices, while in triangles, the term diagonal is often used interchangeably with side.

**Equilateral** – An equilateral polygon is a polygon in which all sides are of equal length. In an equilateral triangle, for example, all three sides have the same length.

**Exterior Angle** – An exterior angle of a polygon is an angle formed by one side of the polygon and the extension of an adjacent side. The measure of an exterior angle is equal to the sum of the measures of the two interior angles that it is adjacent to.

**Interior Angle** – An interior angle of a polygon is an angle formed by two adjacent sides of the polygon. The sum of the measures of the interior angles of a polygon with n sides can be calculated using the formula 180∘ × (n – 2).

**Irregular** – An irregular polygon is a polygon in which not all sides or angles are equal and not all sides are parallel. Its sides and angles may have varying measures.

**Isosceles** – An isosceles polygon is a polygon with at least two sides of equal length. In an isosceles triangle, two sides are of equal length, and the angles opposite those sides are also equal.

**Median** – In a polygon, a median is a line segment joining a vertex to the midpoint of the opposite side. For example, in a triangle, each vertex has a corresponding median.

**Octagon** – An octagon is a polygon with eight sides and eight angles. Its interior angles sum up to 1080 degrees, and it can be regular or irregular.

**Parallel** – In geometry, two lines or line segments are parallel if they lie in the same plane and do not intersect, even when extended infinitely. In polygons, parallel sides have the same slope and maintain a consistent distance from each other.

**Perimeter** – The perimeter of a polygon is the total length of its outer boundary or the sum of the lengths of all its sides. It is a fundamental measurement used to determine the size or extent of a polygon.

**Pentagon** – A pentagon is a polygon with five sides and five angles. In a regular pentagon, all sides and angles are equal, while in an irregular pentagon, they may vary.

**Polygons** – Polygons are two-dimensional closed shapes formed by straight line segments connected end to end. Examples include triangles, quadrilaterals, pentagons, hexagons, and so on.

**Quadrilateral** – A quadrilateral is a polygon with four sides and four angles. Examples of quadrilaterals include squares, rectangles, parallelograms, rhombuses, and trapezoids.

**Regular** – In geometry, a regular polygon is a polygon in which all sides are equal in length, and all angles are equal in measure. Regular polygons have symmetry and can be inscribed in or circumscribed around a circle.

**Rhombus** – A rhombus is a quadrilateral with all sides of equal length. Its opposite angles are equal, and its diagonals bisect each other at right angles.

**Right Angle** – A right angle is an angle that measures exactly 90 degrees. In polygons, right angles are commonly found in shapes such as rectangles and squares.

**Square** – A square is a quadrilateral with all sides of equal length and all angles measuring 90 degrees. It is a type of regular polygon and has properties of both rectangles and rhombuses.

**Symmetry **– Symmetry in polygons refers to a balanced arrangement of shapes, angles, or sides across a line, point, or plane. Polygons can exhibit different types of symmetry, including reflectional symmetry, rotational symmetry, and translational symmetry.

**Trapezoid** – A trapezoid is a quadrilateral with at least one pair of parallel sides. Its non-parallel sides are called legs, and its parallel sides are called bases.

**Triangle** – A triangle is a polygon with three sides and three angles. It is the simplest polygon and can be classified based on the lengths of its sides and the measures of its angles.

**Vertex** – In geometry, a vertex is a point where two or more line segments, lines, or rays meet to form an angle. In polygons, vertices are the endpoints of the sides, and the plural form is “vertices.”