Use Pen tool

Pen tools let you add point to draw line and curve and create a special shape as you want.

1. Click the pen tool Screenshot 2014-09-26 13.41.49 in the left toolbox.
2. Click on canvas to add point. Screenshot 2014-09-26 18.08.13
3. Click and hold to Drag to add a curve point. Screenshot 2014-09-26 18.10.32
4. Add more point or click the first point to complete the shape. Screenshot 2014-09-26 18.11.25
5. Finally, just click on the canvas, then complete draw. Screenshot 2014-09-26 18.12.10

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