As shown in the figure, if you want to subtract three small regular triangles from a regular triangle cardboard with a side length of 12cm to get a regular hexagon, the side length of the subtracted s

As shown in the figure, if you want to subtract three small regular triangles from a regular triangle cardboard with a side length of 12cm to get a regular hexagon, the side length of the subtracted small regular triangle is Because it is a regular hexagon, dk equals kh equals hg equals gf equals ef equals de.

And because all three triangles are regular triangles.

So bh=kh=hg in the triangle bhk.

In the regular triangle cfg, cg=gf=hg.

So bh=hg=cg

Similarly, bk=dk=ad.

ae=ef=fc

So the side length of the cutting triangle is 4.

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