This Monday, Iza came to me and asked for help.
She said that she couldn't make it. There was always a hole.
" One piece is lost. Go and find it." I said.
"No..." Iza said.
I counted. There were 7 pieces. None was missed.
I wondered.
The wooden box is nicely designed for the tangram. It fits.
Within the box, how could she create a "square" with a hole?
" Is the total area always the same? Where is the area of this extra triangle come from??"

We are excited to find that the extra space is gained from the peripheral allowance of the box.
Iza continued to explore how many holes she could create...

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