# AutoCAD exercise: an L bracket > Draw an L bracket in AutoCAD with relative coordinates: its outline, a fillet, two holes and baseline dimensions, solved step by step. Practise it free online. Draw this bracket, in millimetres: 100 long, a foot 20 high and an upright 30 wide and 80 high, the inside corner rounded to a radius of 10, a hole of 8 in the foot and one of 10 in the upright, each centred in its leg. The outline is one run of [`LINE`](https://mellowcad.com/docs/commands/line.md), each point typed as how far it goes from the last, and its dimensions all start from the bottom left corner. - **Exercise:** Beginner · Mechanical · 2D - **Commands:** [`LINE`](https://mellowcad.com/docs/commands/line.md), [`FILLET`](https://mellowcad.com/docs/commands/fillet.md), [`CIRCLE`](https://mellowcad.com/docs/commands/circle.md), [`DIMLINEAR`](https://mellowcad.com/docs/commands/dimlinear.md), [`DIMBASELINE`](https://mellowcad.com/docs/commands/dimbaseline.md), [`DIMRADIUS`](https://mellowcad.com/docs/commands/dimradius.md), [`DIMDIAMETER`](https://mellowcad.com/docs/commands/dimdiameter.md) - **In the editor:** [Open it with its drawing](/draw?drawing=l-bracket), dimensioned beside where you draw yours ## The drawing The L bracket, 100 by 80, dimensioned from its bottom left corner. ## Step by step The engine draws each step and writes its history as you would type it: the prompts in AutoCAD 2027's order, with the same option letters. After a command's first point, a typed point is measured from the last one, as dynamic input measures it, and the history writes it with @; \# measures from the origin. ### 1. Draw the outline On the Outline layer, [`LINE`](https://mellowcad.com/docs/commands/line.md) from `0,0`, then each point as a step from the last: `100,0`, `0,20`, `-70,0`, `0,60` and `-30,0`. `Close` draws the last side back to the start and ends the command. 1. Draw the outline ```text Command: LINE Specify first point: 0,0 Specify next point or [Undo]: @100,0 Specify next point or [Undo]: @0,20 Specify next point or [Close/Undo]: @-70,0 Specify next point or [Close/Undo]: @0,60 Specify next point or [Close/Undo]: @-30,0 Specify next point or [Close/Undo]: C ``` ### 2. Round the inside corner [`FILLET`](https://mellowcad.com/docs/commands/fillet.md): choose `Radius`, type `10`, then pick the two lines that meet at the inside corner, the foot's top and the upright's side. 2. Round the inside corner ```text Command: FILLET Current settings: Mode = TRIM, Radius = 0.00 Select first object or [Undo/Polyline/Radius/Multiple]: R Specify fillet radius <0.00>: 10 Select first object or [Undo/Polyline/Radius/Multiple]: Select second object or shift-select to apply corner or [Radius]: ``` ### 3. Draw the holes Two circles with [`CIRCLE`](https://mellowcad.com/docs/commands/circle.md), each by its `Diameter`: `8` at `80,10`, in the foot, and `10` at `15,65`, in the upright. 3. Draw the holes ```text Command: CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 80,10 Specify radius of circle or [Diameter]: D Specify diameter of circle: 8 Command: CIRCLE Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: 15,65 Specify radius of circle or [Diameter] <4.00>: D Specify diameter of circle <8.00>: 10 ``` ### 4. Dimension it On Dimensions, [`DIMLINEAR`](https://mellowcad.com/docs/commands/dimlinear.md) from `0,0` to the foot's hole, `80,10`, placed below: 80. [`DIMBASELINE`](https://mellowcad.com/docs/commands/dimbaseline.md) goes on from the same first extension line: type the right end, `#100,0`, where # measures from the origin, then Enter twice to end it. The same up the left side, to the upper hole and then to the top, `#0,80`. [`DIMRADIUS`](https://mellowcad.com/docs/commands/dimradius.md) on the fillet and [`DIMDIAMETER`](https://mellowcad.com/docs/commands/dimdiameter.md) on each hole finish it. 4. Dimension it ```text Command: DIMLINEAR Specify first extension line origin or : #100,0 Dimension text = 100 Specify second extension line origin or [Select/Undo] : 0,0 Specify second extension line origin: @15,65 Non-associative dimension created. Specify dimension line location or [Text/Angle/Horizontal/Vertical/Rotated]: Dimension text = 65 Command: DIMBASELINE Specify second extension line origin or [Select/Undo] : Select base dimension: Command: DIMRADIUS Select arc or circle: Dimension text = 10 Specify dimension line location or [Text/Angle]: Command: DIMDIAMETER Select arc or circle: Dimension text = 8 Specify dimension line location or [Text/Angle]: Command: DIMDIAMETER Select arc or circle: Dimension text = 10 Specify dimension line location or [Text/Angle]: ``` ## More exercises - [AutoCAD exercise: stairs in plan](https://mellowcad.com/docs/exercises/stairs.md): Beginner · Architecture · 2D - [AutoCAD 3D exercise: a mounting plate](https://mellowcad.com/docs/exercises/mounting-plate.md): Beginner · Mechanical · 3D solid - [AutoCAD exercise: a flange](https://mellowcad.com/docs/exercises/flange.md): Intermediate · Mechanical · 2D - [AutoCAD practice exercises](https://mellowcad.com/docs/exercises.md)