print("Enter the coordinates of point A")
x1=int(input("X = "))
y1=int(input("Y = "))
print("Enter the coordinates of point B")
x2=int(input("X = "))
y2=int(input("Y = "))
print("Enter the coordinates of point C")
x3=int(input("X = "))
y3=int(input("Y = "))
print("Enter the coordinate of point D")
x4=int(input("X = "))
y4=int(input("Y = "))
A=(abs(x1*(y2-y4)+x2*(y3-y1)+x3*(y4-y2)+x4*(y1-y3)))*0.5
print("(",x1,",",y1,")"," ","(",x2,",",y2,")")
print(' A____________B')
print(' | |')
print(' | |')
print(' | |')
print(' C____________D',)
print("(",x3,",",y3,")"," ","(",x4,",",y4,")")
print("\n","Area of the quadilateral =",A)