Can you cut the E into seven pieces with just four straight cuts and reassemble the pieces into a square?
When I wrote that you need to cut it into seven pieces, it’s actually a hint. Did you figure it out?
The letter “E” figure above is constructed using the seven tangram pieces. So, if you were able to figure it out, it would be pretty easy to cut the E into the seven tangram pieces and then form a square using them.