Discover how to use geometry vocabulary to describe angles in this interactive activity.
[i]Answer these open ended questions on your own or with others to form deeper math connections. [/i]
Explore the interactive angle activity. Move the points and observe how the size of the angle changes. Try to create different types of angles and pay attention to the angle measure and its name.
Move the points to create an acute angle. What is the measure of your angle?
Move the angle until it measures exactly 90°. What type of angle is it?
Move the points to create an obtuse angle. What is the measure of your angle?
[b]Challenge: [/b]Move the points to create an angle that is close to 120°. Record the angle measure and identify the type of angle. Explain how you know your answer is correct.
Angles have different sizes and can be classified according to their measures. An acute angle measures less than 90°, a right angle measures exactly 90°, an obtuse angle measures more than 90° but less than 180°, and a straight angle measures exactly 180°. By moving the points in GeoGebra, we can observe and discover how the size and type of an angle change.