Proof sorter - circumference angles

Age
11 to 16
Challenge level
filled star empty star empty star
Exploring and noticing Working systematically Conjecturing and generalising Visualising and representing Reasoning, convincing and proving
Being curious Being resourceful Being resilient Being collaborative

Problem

In Circumference Angles you were asked to investigate the angles made at the circumference and at the centre of a circle. 

You may have noticed that the angle at the centre of the circle was double the angle at the circumference.

Below is a diagram, and a proof that has been scrambled up.

Can you rearrange it into its original order?

Proof Sorter - Circumference Angles