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polygon

Definition: a closed plane figure bounded by straight sides
Sentence: Polygons are shapes.

Sides and vertices of a polygon

Definition: each endpoint of a side of a polgon, plural is vertices
Sentence: You can have sides and vertices in a polygon.

Convex

Definition: curving or bulging outward
Sentence: A polygon is convex if no line that contains a side of the polygon contains a point in the polygon.

Concave

Definition: curving inward
Sentence: A polygon that is not convex is a called concave.

Equilateral

Definition: having all sides or faces equal
Sentence: If a polygon's sides are the congruent it is called equilateral.

Equiangular

Definition: having all angles equal
Sentence: A polygon is equiangular if all its interior angles are congruent.

Regular

Definition: Equilateral and equiangular
Sentence: If a polygon is regular it is equilateral and equiangular.

Diagonal

Definition: A straight line connecting any two vertices of a polygon that are not adjacent
Sentence: Diagonals are lines inside a triangle.

Parallelogram

Definition: A quadrilateral with two pairs of parallel sides
Sentence: In addition to quadrilaterals we will learn about parallelogram.

Rhombus

Definition: a parallelogram with 4 congruent sides
Sentence: Rhombuses are shapes in geometry.

Rectangle

Definition: A parallelogram with four right angles
Sentence: A rectangles width is congruent and its height is congruent.

Square

Definition: A quadrilateral with 4 sides that are equal and has all 90 degree angles
Sentence: A square has four congruent sides.

Trapezoid

Definition: a quadrilateral with exactly one pair of parallel sides
Sentence: A trapezoid always has a parallel pair.

Isosceles trapezoid

Definition: a trapezoid with congruent legs
Sentence: A isosceles trapezoid has two congruent sides.

midsegment of a trapezoid

Definition: A segment whose endpoints are the midpoints of the non-parallel sides of the trapezoid
Sentence: A trapezoid can have a midpoint.

Kite

Definition: a quadrilateral with two pairs of adjacent, congruent sides
Sentence: A kite is a term used in geometry.

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