Draw a shape in Numbers on Mac
You can create your own freehand shapes.
Click
in the toolbar, then click 
.Click anywhere on the sheet to create the first point of the custom shape.
Move the pointer, then click to create another point; continue adding as many points as you want.
To create a curved segment, click then drag, then click again to finish the segment.
To delete a segment you just created, click a point to select it, then press the Delete key.
To complete the shape, do one of the following:
Close the shape (add a solid line between the last and first points): Click the first point.
Leave the shape open (no line between the last and first points): Press the Esc (Escape) key.
To modify the points or line contours of the shape, click the shape to select it, then choose Format > Shapes and Lines > Make Editable (from the Format menu at the top of your screen).