That is a tricky one and @impixel is correct, that you would need to use the rotate function (typed in text mode) to get that to work properly.
I would also add that in order for the rotate to work the way your mind thinks it should, you would want to change the origin as well to 200, 200 as is described in the related post below (about rotating text). Otherwise, it rotates around the origin at 0,0. Finally, if you only want to rotate part of your drawing, you need to rotate it back the same number of degrees you rotated it with before drawing the rest of your image or it will all be rotated.
Some people choose to create a sprite instead of using a shape as sprites can be rotated with the rotate block, so if your student can wait to learn about sprites first, that may be a lot easier than playing with rotations and translations, but the link below is a good primer on how you COULD rotate a shape if you really want to.