Tangram
Move all 7 shapes to match the target picture. Drag a shape to move it. It snaps to a small grid to make alignment easier. Double-click a shape to turn it 45°. Use Flip when you need to mirror a shape. A red status means shapes overlap or sit outside the board.
How marking works. This page checks that your shapes form a valid Tangram. It does not know the target answer. When you submit, the server signs your current arrangement and recent action history. The course grader checks the signature and compares your arrangement with the target.
Move pieces
You can also use the arrow keys to move the selected shape. Q/E rotate it. F flips it.