Move the points A, B or C and compare the angles. What do you notice?
Change the "steps" selector and note the justification steps. Do you understand?[br]If you have not understood the property of the external angle [url=https://www.geogebra.org/m/eFMvcngj]click here[/url] and check.[br]Return the selector to step 0. Move point C down. Observe the justification steps. Do you understand?[br]Return the selector to step 0. Move point C upwards. Observe the justification steps. Do you understand?
Change the position of point C and compare the angles of the circular segment and the center angle. What do you notice?
What is the angle of the AEB? and the angle ADB? Why?
The activity was elaborated in Portuguese (Brazil) and translated into English. It is important to improve! [url=mailto:jcassio@gmail.com]jcassio@gmail.com[/url]