# Rays, angles and angle bisector

- Author:
- Jorge Cássio

- Topic:
- Angles, Line Segment

## 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.

## Protractor

## Activity 2

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

## Consecutive and Adjacent Angles

## Vertically Opposite Angles

## Property

## Question

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