Draw a square sign with a red arrow shape. The arrow points to the right. This sign warns drivers about a bend.

1. Draw a white square with a gray outline. Its corners are (-150, -150), (150, -150), (150, 150), and (-150, 150).
2. Draw a filled red shape on top of it. Use these six corners in this order: (-150, 150), (0, 150), (150, 0), (0, -150), (-150, -150), and (0, 0).

A shape with sharp corners is easy to draw. Use goto() to move from corner to corner. Go back to the first corner at the end.