### 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.

### 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.