Can you make a regular hexagon using only yellow triangles ?
Can you make a regular hexagon using only green triangles ?
Can you make a regular hexagon from yellow triangles that is the same size as a regular hexagon made from green triangles ?
Did that tell you something about yellow and green triangles, about how they relate to each other ?
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Also, if you wish, follow the 'Hint' tab at the top of this screen for more help.
And when you've got inside this problem and started to feel your way around, please do take a look at Impossible Triangles? - it's the perfect follow on. There's even a video to watch to make getting started easy.