Dodecagram dodecagon
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12
Yes mam
The prefix is dodeca- which, in Greek, refers to 12.
A dodecahedron has 20 sides, which are all pentagons. "Dodeca" means "do" (2) times "deca" (10).
Since this sentence is lacking a predicate, it is virtually impossible to answer. "Geometry words that start with r" is a legitimate noun phrase, but is so incomplete that it cannot be answered.