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Circle Theorems: Quiz 0 – Answers
​1)
OAB = 58°
OBA = 58°
 
2)
COD = 134°
ODC= 23°
 
3)
EFO = 75°
FOE = 30°
 
4)
OGH = 14°
OHG = 14°
Working
Questions
1) O is the centre of the circle below. The points A and B lie on the circumference of the circle. Find the size of angles OAB and OBA.

2) O is the centre of the circle below. The points C and D lie on the circumference of the circle. Find the size of angles COD and ODC.

​3) O is the centre of the circle below. The points E and F lie on the circumference of the circle. Find the size of angles EFO and FOE.

​4) O is the centre of the circle below. The points G and H lie on the circumference of the circle. Find the size of angles OGH and OHG.