Question 30195
{{{drawing(600,600,-10,20,-10,20,red( line( 0, 0, 20,0 ) ),locate( 0, 0, O ),red( line( 12, 0,12,5 ) ),locate( 12, 0, Q ),red( line(0,0,0,20 ) ),green(line(0,0,12,5)),locate( 12, 5, P ),locate(20,0,X ),locate(0,20,Y))}}}
IN THE ABOVE DIAGRAM 
OX IS THE INITIAL LINE .....REAL AXIS
OY....IS THE IMAGINARY NUMBER LINE/AXIS
P IS A POINT IN COMPLEX PLANE
LENGTH OP IS CALLED MODULUS OF  Z  WHICH IS A COMPLEX NUMBER DENOTED BY |Z|
HERE WE PLOTTED P AS 12+5i
|Z|=OP=SQURE ROOT OF (12^2+5^2)=13
ANGLE POX IS TAN INVERSE(5/12)=22.6 DEGREES.