Angles are formed when two or more lines intersect. Angles are majorly measured in degrees. 
The required proof is as shown below:
Whenever a transversal passes through two parallel lines, angles are formed which have some similar properties.
              STATEMENTS                                           REASONS
1. AB ║DC                                                          Given.
2. < FDC ≅ < FBA                                              Alternate angle theorem.
3. <AFB  ≅ < DFC                                              Vertical opposite angle rule.
4. DF ≅ BF                                                         Given
5. ΔDFC  ≅ Δ BFA                                            Angle-Angle-Side property
For more clarifications on the properties of angles formed by a transversal, visit: https://brainly.com/question/14589220
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