Sangaku is a Japanese tradition of celebrating geometrical beauty, popular during the Edo period (1603-1867).  The traditional sangaku is a wooden tablet on which a geometric problem is written with colorful paint.  The tablets were displayed in Buddhist temples and Shinto shrines as an offering, as a puzzle for others to think over and understand, and as a way for their creators to show off their geometric discovery.  Many are so beautiful that they are considered works of art.

Although most of these sangaku were lost, almost nine hundred survive, scattered all throughout Japan.  The book "Sacred Mathematics - Japanese Temple Geometry" by Fukagawa Hidetoshi & Tony Rothman contains a wonderful look at the history of Japanese mathematics as well as many examples of sangaku.

Results that may be useful

Here is an impassioned plea for returning Mathematics to its rightful place among the Arts by a radical revision of Mathematics education:
A Mathematican's Lament
Below are examples of sangaku for your problem solving enjoyment!
More difficult problems
Circle, Triangle & Square
Circle & 2 Squares
Square & 2 Circles
Circle of Coins
Circle & 2 Triangles
4 Circles
16 Circles
8 Circles
6 Circles, Square & Triangle
Three Incircles
2 Circles & 2 Squares
Three Circles
Ten Circles
11 Circles
Triangle & 4 Circles