Tangram Puzzle Board

About the seven pieces

A tangram is cut from one square into two large triangles, one medium triangle, two small triangles, one square and one parallelogram. Their areas are fixed fractions of the original square, which is why some figures are impossible to fill exactly. The coverage check samples a grid of points across the outline, so it measures how much of the target is covered rather than proving a mathematically exact fit.

Tip: the two large triangles together make exactly half the square. Place them first, then fill the remaining wedge with the smaller pieces.