Polygons Polygons Simple n Closed figure n Made

Polygons

Polygons Simple, n Closed figure n Made up of line segments n

Types of Polygons Triangles three sides Quadrilaterals four sides

Pentagon five sides

Pentagon five sides Hexagon six sides Heptagon seven sides

septuplets

Octagon eight sides

STOP

Octagon eight sides Nonagon nine sides Decagon ten sides

Review A polygon is a simple, closed, figure made up of line segments. A polygon is classified by the number of sides it has.

Can you classify these polygons?

Regular Polygons n A regular polygon has all sides and all angles congruent. A Which is a regular polygon? B

Triangles n Triangles can be classified by their sides or by their angles.

Triangles Classifying triangles by the angles….

Acute Triangle All angles are acute.

Right Triangle Contains one right angle.

Obtuse Triangle Contains one obtuse angle.

Classify Triangles by their angles n Acute – All angles are acute n Right – Contains one right angle n Obtuse – Contains one obtuse angle

TRIANGLES Classifying triangles by their sides…

TRIANGLES SCALENE

TRIANGLES SCALENE ISOSCELES

TRIANGLES SCALENE ISOSCELES EQUILATERAL

Classify triangles by its sides n Scalene – No sides congruent n Isosceles – Two sides congruent n Equilateral – All sides congruent

WHAT IS A REGULAR TRIANGLE CALLED?

QUADRILATERALS

QUADRILATERALS SQUARES

QUADRILATERALS SQUARES RECTANGLES

QUADRILATERALS SQUARES RECTANGLES PARALLELOGRAMS

RHOMBUS

RHOMBUS TRAPEZOIDS

WHAT ARE REGULAR QUADRILATERALS CALLED?

Squares