Quadrilateral points W,I,L,D is inscribed in circle O. WI is the diameter of O.
what is the angle of D?

Answer:
As shown in picture, Quadrilateral points W,I,L,D is inscribed in circle O.
=> D + I = 180 (sum of two opposite angles)
=> D = 180 - I = 180 - 45 = 135 deg
Hope this helps!
:)