Each side creates an angle between {TAIL ~ about 50°} and {HEAD ~ about 70°} from the base to a side 
Each side creates an angle between { TAIL ~ about 50 ° } and { HEAD ~ about 70 ° } from the base to a side
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH