• You name polygons by the number of sides.

• REGULAR POLYGONREGULAR POLYGON – ALL SIDES ARE CONGRUENT AND ALL ANGLES ARE CONGRUENT.

Classifying Polygons

Classifying Polygons• You name polygons by the number of

sides.

# of sides = 3

Name – Triangle # of sides = 4

Name – Quadrilateral

# of sides = 5

Name – Pentagon

Classifying Polygons

# of sides = 6

Name – Hexagon # of sides = 8

Name – Octagon

# of sides = 10

Name – Decagon

http://mathforum.org/dr.math/faq/faq.polygon.names.html

Special Quadrilaterals

• 2 lines are parallel parallel in they lie in the same plane and DO NOT intersect

Trapezoid – has exactly one pair of parallel lines.

Parallelogram – both pairs of opposite sides parallel

Special Quadrilaterals

Rhombus – is a parallelogram with four congruent sides.

Rectangle – is a parallelogram with four right angles

Square – is a parallelogram with four right angles and four congruent sides.