**Known** **values**: Curve radius **R**, Tangents **E1** and **E2**.

**Solution**: Positions of main components **A**, **M**, **T** on the ground.

**Step 1**: Define two auxiliary points **B** and **C** reciprocally visible along tangents **E1** and **E2** respectively, and measure length **(BC)**.

**Step 2**: Measure angles **δ _{1}** and

**δ**and calculate supplementary angles

_{2}**γ**and

_{1}**γ**.

_{2}

**Step 3**: Applying sine law on triangle **KBC**:

Calculate **(KB)** and **(KC)**:

**Step 4**: Calculate lengths **(KA)** and **(KT)** along tangents by entering known values for angle **α** and radius **R** on the following functions:

**Step 5**: Calculate lengths **(BA)** and **(CT)**, occupy points **B** and **C** and define points **A** and **T** respectively:

**Step 6**: To define arc’s middle point **M**, apply sine law on triangle **BKD** and calculate length **(BD)** along **BC** line:

**Step 7**: Define and occupy point **D** on the ground by measuring length **(BD)** along direction **BC**, define angle **ω** and direction of line **KM** and finally define middle point **M** by measuring length **(DM)** along direction of line **KM**.