• edinbruh@feddit.it
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      15 hours ago

      It works because of triangles. Just start drawing some diagrams and you’ll quickly figure out how on your own. Which is more fun than having someone give you a geometric proof.

      • 0ops@lemm.ee
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        15 hours ago

        Oh yeah look at that. Looks like the measurable size is slightly less than half though since the eyes are generally a little closer to the mirror than the widest part of the head