Now create the vertical line and the second arc.
Click Line on the Sketch toolbar, or right-click in the graphics area and select Line from the shortcut menu.
Sketch a vertical line downward approximately 150mm long, starting at the lower endpoint of the arc.
Do not dimension the line at this time.
Click 3 Point Arc on the Sketch toolbar, or right-click in the graphics area and select 3 Point Arc.
You might need to click the down arrow on the Arc flyout button to select the 3 Point Arc tool.
Sketch an arc so that the arc centerpoint and endpoints are coincident with the line. (Watch for the pointer.) Use the following measurements:
Length approximately 40mm (L=40)
Angle approximately 180° (A=180)
Radius approximately 20mm (R=20)
After clicking to end the arc, set the angle to 180° in the Parameters section of the PropertyManager.
Click Smart Dimension on the Sketch toolbar or right-click in the graphics area and select Smart Dimension, then dimension the arc radius to 20.