Question 618392
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
In the coordinate plane, 3 vertices of rectangle MNOP are M(0,0) N(0,c) P(d,0). 
What are the coordinates of point O? O(d,c)
Hope this sketch helps: Pt O needs to up from Pt P to the height of Pt N
{{{drawing(300,300,   -6, 6, -6, 6,  
circle(0,0,0.2),
locate(-.5,0 ,M),
circle(0, 4,0.2),
locate(-.5,4 ,N),
circle(5, 0,0.2),
locate(5,-.5 ,P),
circle(5, 4,0.2),
locate(5.5,4.5 ,O),
graph( 300, 300, -6, 6, -6, 6))}}}