Proof of the Circle Theorems

$Y\,$ and $Z\,$ are points on the circumference of a circle, centre $O$ .

Prove that angle $W X Y +$ angle $180^\circ$ .

[4]

$Y\,$ and $Z\,$ are points on the circumference of a circle, centre $O$ .

Prove that angle $W X Y +$ angle $180^\circ$ .

[4]

Proof of the Circle Theorems Questions