Tri/Quad/Pent/Cent

a series of three books or plays

• trilogy
• quadruped
• century
• quintuplet

a four-footed creature

• quadruped
• trilogy
• quintuplet
• pentagon

a period of 100 years

• trilogy
• quintuplet
• pentagon
• century

a polygon having five sides

• quintuplet
• pentagon
• trilogy
• century

one of five babies born at one birth

• trilogy
• quadruped
• twins
• quintuplet

3 = 

• tri
• quad
• quint
• cent

100 = 

• tri
• quad
• pent
• cent

4 = 

• tri
• quint
• dec
• quad

5 = 

• quad
• quint
• dec
• tri

10 = 

• cent
• pent
• dec
• quint