Exercise no. 2 : Perpendicular lines

We keep the directions we are used to: v, h, d1, d2 and do the followings:

– we trace 2 parallel lines and between them, at exactly 90 degrees, we trace perpendicular lines.
– we do this exercise at least 4 times, on all our 4 directions we know.
– let’s be careful not to leave empty spaces and also, not to exceed the lines like here:

Why is this good?

It is an exercise that has in view the future shading.

Do’s and don’ts

we have to keep the 90 degrees and not other inclination.

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