Create a fillet between elements

• Click on the Fillet Elements icon in the Modify toolbar.

• Enter the value Fillet Radius = 5, and leave the option Trim Elements checked.

• To select the elements for the fillet operation, click on the circle by A and on the line by B.

• From the possible solutions select the part of the circle which makes the right fillet. In the picture below you can see how it should look.

• Do the same by the vertical line.

• Click on the Delete icon and delete the two residual lines (the ones pointing away from the center of the circle).