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