Answer:

Step-by-step explanation:
Given
z = 1 + √3 i
Let 
Squaring both sides

Comparing real and imaginary part
Re(LHS)=Re(RHS)
...........................(1)
comparing Im(LHS)=Im(RHS)
√3=2pq

Substitute q in equation (1)


Let 



we take only Positive value because 
x=2.5

thus 

thus,

So, if you add 25 and 52 you get 75. All angles of a triangle need to add up to 180. the angle c will be around 105 degrees i assume