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