Create A, B, D points first: select

,hold down the Option(Mac) or Alt(Windows) key, left click point F, enter -1cm in the “X distance” column, click “OK” to create point A. Similarly, left click point G, enter -1cm in the “X distance” column to create point B. Similarly, left click point B, enter 1.5cm in the “X distance” column to create point D.