• Knowing of what are parallel and transversal lines, and alternate, corresponding and consecutive angles.
• Understanding and knowing how to apply the parallelism theorem.
• Knowing how to build parallel lines, using a ruler and a compass.
• Understanding and knowing how to apply the postulate of “Unicity of the parallel line”.
• Understanding and knowing how to apply the Exterior angle theorem.
• Understanding and knowing how to apply the theorem "sum of the internal angles of a triangle".
