Question

$A(5,3),B(-1,3)$ and $C(-1,-1)$ are the three vertices of a rectangle $ABCD$. Plot the given points on a graph paper and then use this graph to find the co-ordinates of the fourth vertex $D$.

Answer 1

Mark the points $A,B,C$. Extend the sides to meet at $D$. Hence, $D=(5,-1)$.