• Poly means many • gon means side • So polygons means many sides
• A polygon must only be made of straight sides. • The shape must be closed.
These are polygons.
These are not polygons.
Regular polygons have all sides the same length.
In this case regular is the opposite of irregular. What does irregular in clothing mean? Badly stitched in some small area, wrong sizing. The rejects from the good clothes basically.
This are irregular polygons.
Tri means 3 • Triangles have 3 sides.
triplets
tricycle
trio
trident
triathlon
triple
triceratops
quad means 4 • Quadrilaterals have 4 sides.
quadruple • 4 x
quadriceps
quadruplets
quadriplegic
quadrunner
penta means 5 • Pentagons have 5 sides.
pentagon
Pentathlon 5 events show jumping fencing shooting swimming running
pentagonal star
Pentateuch • First 5 books of the Bible
Hex means 6 • Hexagons have 6 sides.
Hex head bolts
Hex head nuts
6 equilateral triangles together make a hexagon.
Oct means 8 • Octagons have 8 sides.
octave • 8 notes • do, re, me, fa, so, la, ti , do