Hi @postYRNZJ 

Command line input should be:

Command: ARC
Specify start point of arc or [Center]: C
Specify center point of arc: 120,60
Specify start point of arc: 15.75 <- turn ORTHO mode on, move mouse vertically from the center point and type 15.75
Specify end point of arc (hold Ctrl to switch direction) or [Angle/chord Length]: A
Specify included angle (hold Ctrl to switch direction): 150

For the second task - the same, but in the step #3 (after turning ORTHO on) - move mouse to the left from the center point of arc.