New posts in Sangaku

Sangaku: to prove one of the intangents is parallel to $BC$

What is the size of each side of the square?

Japanese Temple Problem From 1844

Sangaku - Find diameter of congruent circles in a $9$-$12$-$15$ right triangle

Geometry sangaku puzzle, incribed circle circle/triangle/square

Difficult Recurrence

Sangaku. How to draw those three circles with only a ruler and a compass?

Sangaku: Show line segment is perpendicular to diameter of container circle

sangaku - a geometrical puzzle