Proof of the Circle Theorems

$C\,$ and $D\,$ are points on the circumference of a circle, centre $O$ .

A circle with center O and an inscribed quadrilateral ABCD.

Prove that angle $ABC\,$ and angle $ADC\,$ add to $180∘180^\circ$

[4]

$C\,$ and $D\,$ are points on the circumference of a circle, centre $O$ .

A circle with center O and an inscribed quadrilateral ABCD.

Prove that angle $ABC\,$ and angle $ADC\,$ add to $180∘180^\circ$

[4]

Proof of the Circle Theorems Questions