The tangram is a dissection puzzle originating from China, consisting of seven flat polygons (tans) that together form a square. The challenge: rearrange all seven pieces to match a target silhouette. With just these pieces — five right triangles, one square, and one parallelogram — over 6,500 distinct figures can be formed. Drag pieces to move them. Use the scroll wheel or rotate buttons to rotate. Right-click or use the flip button on the parallelogram to flip it.