Rays, angles and angle bisector

Activity 1

Did you fully understand the terms? In case you had any doubts, write them here.

Look them up on the internet

1- What are acute, right and obtuse angles?

Measuring an angle - Amplitude

The measurement of an angle is a positive real number related to it. The measure of an angle is called the angle amplitude.


Activity 2

In the construction above, move points B or C. What do you see?

Consecutive and Adjacent Angles

Vertically Opposite Angles



What have you noticed? Write an argument to justify your answer.


Complementary Angles

Supplementary angles