• edinbruh@feddit.it
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      2 days ago

      Try it. Look at a mirror and put a ruler on the mirror, the size of your face on the mirror will always be the same, no matter how far you are. It will be half the size of your actual face.

        • edinbruh@feddit.it
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          16 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