Drawing Circles in Perspective

Drawing a circle inscribed in a square freehand is very simple if you divide the square into eight equal parts:
Draw two diagonals from the corners, then, at their intersections, draw a vertical line and then a horizontal one.
This gives you the points to draw the arcs that will form the circle.

Use the same principle to draw circles in perspective.
Create a square in perspective using the diagonal method.
Then, divide it in the same way you divided the square in a front view, but following the rules of perspective.

Next, draw the curves from quadrant to quadrant to obtain the circle in perspective.

The process is the same on any part of the drawing surface.

If you want an audiovisual guide, check out the short video on my channel:
https://www.youtube.com/@JVandePerre/shorts

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by J.Van de Perre - video demo, painting process

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I wish you a very nice day!