Write down the size of angle ABC.
Give a reason for your answer.
                                             
                                          
                                          
                                        
											 
											Answer:
Angle ABC = 90°
Step-by-step explanation:
Angle AOC= 180°
so Angle ABC = 0.5 x AOC
or another way to explain is
Rule 1: Angles in semi circle are always 90°