10.2 Angles in a Circle[br]Angle at centre is two times the angle at the circumference.[br](angle at centre 2 times angle at circumference)

1. Click and drag points C and D to adjust the angle at the centre.[br] What do you realize about the relationship between angle at the centre and angle at the circumference?[br][br]2. Click and drag point B to change the position of the angle at the circumference.[br] How does this affect the angle at the circumference?[br][br]3. Adjust the angle at the centre to 180 degrees. [br] What do you realize about the angle at the circumference?[br][br]4. Adjust the angle at the centre to greater than 180 degrees.[br] Does the relationship between angle at the centre and angle at the circumference still hold?