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