Here's an easy to understand geometric question, with a purely look-and-see solution. It comes from YouTuber Michael Penn but I have modified it slightly.
To be in the spirit of the traditional wooden Japanese temple offerings, called Sangahu, I have added decorative colours.
If the larger square is 1 x 1 and so has area 1, what is the area of the smaller square?
This is a Sangaku-like puzzle (see https://learn1.open.ac.uk/mod/oublog/viewpost.php?post=230691)
We have a square inscribed in a triangle of known base b and height h, as shown. What is the length s of the square's side?
I called this a Samurai puzzle because many of the original sangaku were the work of Samurai.
(Solution in Comments.)
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