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

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

**Step 1**: Occupy node **K** and measure angle **θ** (included angle between main tangents).

**Step 2**: Calculate supplementary angle **α**

**Step 3**: Calculate lengths (**KA**) and (**KT**) along tangents and (**KM**) by entering known values for angle **α** and radius **R** on the following functions:

**Step 4**: Arc’s length (**AMT**) is calculated through function:

where:

** gon = gradian*