A = ( 0 , 9 ) , B = ( 0 , 9 ) , C = ( 5 , - 1 ) , D = ( 0 , 3 )
p1 . x = 0 ; p1 . y = 9 ; p2 . x = 0 ; p2 . y = 9 ; p3 . x = 5 ; p3 . y = - 1 ; p4 . x = 0 ; p4 . y = 3 ; Console . WriteLine ( no_of_quads ( p1 , p2 , p3 , p4 ) ) ; } }