Some help needed scale down a plane while maintaining angle

[mamo75]

Hi,

Ok these are the steps I took to make my array stairs on the pyramid.

My pyramid ramp is not at the same angle as in the lesson video, so I measured the angle using the ruler, angle is 130.26 degrees.
Divided by 2 = 65.1 degrees in which I created 2 planes to create the steps of the chairs.
Come to think right now, that I measured the angle on the wrong axis, but strangely the plane ended up in what seems visually right angle )

Well, it took me some hours to get to this point where I am, but now I’m stuck in the point of a simple scaling of one of the planes.
The vertical plane is too big, it is placed in the correct angle and on the right y-axis of the horizontal plane.
But as shown in the screenshot, it must be scaled down so that the 2 Y-axis (upper and bottom edges) of the plane are scaled down to the right place , whilst maintaing the correct angle and shape.

When I try to move the edges the shape, the angle and place of the complete plane changes.
While typing this I also tried scaling the face with Shift-Y, that helps a little as seen in screenshot 2.
But again, how to scale it down so it perfectly fits in the ramp?

I hope I wrote this down in understandable choise of words.

Since I am a novice in Blender I suspect there are more efficiënt ways or better ways to create a stairway in my pyramid, with a strange angled ramp, so any advice will be much appreciated.

Greets
Martijn.

Screenshot 1:

Screenshote 2:

[mamo75]

Ok I found out that setting the 3D manipulator to normal orientation made it possible to use the red arrow and edge select to manually modify the edges of my plane while the shape and angle survived in its original situation.

That resulted after an array modifier in the situation shown in this new screenshot :

Unfortunatly the stairway goes out of bounds at the middle and top of the ramp.
Perhaps the angle has to be more precise or there needs to be a bit more space between every step?

[mamo75]

Ok I modified the rotation angle by holding the shift key and by visual guestimation I adjusted it to nearly perfection as you can see in the next and final screenshot: