1. Drag the slider to change the radius. Move the Point to change the size of the angle.[br]a). How does changing the radius affect the angle size?[br]b). How does changing the radius affect the arc length?[br][br]2. Move the Point to create an angle of 1 radian measure.[br]a). Change the radius. What do you notice?[br]b). If an angle is 3 radians in size, what type of angle is it? Acute, obtuse or reflex?[br][br]3. Write down what you think 180 degrees in radian angle measure would be.[br]Then use the app to check your response.