Explanation:
as angle KPL is 90°, so is angle NPL, as this is the second half of the NK half-circle.
since angle NPL = 90°, the angle NPM = 90 - 63 = 27°.
that means also angle JPK = 27°.
as the lines NK and MJ are diameters of the circle.
because all these angles are at the center of the circle they are all also arc angles.
arc angle NJ = arc angle NK - arc angle JK =
= 180 - 27 = 153°
the arc angle MJL = the full circle minus 63°.
arc angle MJL = 360 - 63 = 297°