p1 =(0.0, 0.0)[0.0 : 0.0]
p1 =(5.0, 2.0)[0.3805063771123649 : 5.385164807134504]
p1 =(0.7071067811865475, 0.7071067811865476)[0.7853981633974483 : 1.0]
p1 =(1.9999069075401812, 4.999859734149856)[0.3805 : 5.385]
