Make Smooth Curves Using Google Drawings

Choose the “Curve” type of link

Click on the canvas to mark the starting point of the curve. Then click everywhere you want an inflection point. When you’re done, double-click to finalize the curve.

Click on the curve to show a bounding box with handles. Drag each handle to resize the curve.

Double-click on the curve to show the nodes on the curve. Then drag each node to shape the curve.