1.3. Angles.

Basic concepts. https://www.smartick.es/blog/matematicas/geometria/angulos-i/
Some pictures that may help.
Supplementary angles:
Vertical angles:
Adjacent angles:
Complementary angles:
Activity 1. True or false?
– Helena Gené, Rogelio Chambi Apaza, Jorge Cássio, Simon Job, Tim Brzezinski, María Morales Cruz

Information: 1.3. Angles.