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