In the proof, $E$ is the second intersection point of side $AD$ with the auxiliary circle through $A,B,C$. We deduce $\a

Question

In the proof, $E$ is the second intersection point of side $AD$ with the auxiliary circle through $A,B,C$. We deduce $\angle AEC = \angle ADC$, which contradicts—

Accepted Answer

an exterior angle being greater than the opposite interior angle

Answer

the angle sum of a triangle

Answer

the law of sines

Answer

the law of cosines

In the proof, EEE is the second intersection point of side ADADAD with the auxiliary circle through A,B,CA,B,CA,B,C. We deduce ∠AEC=∠ADC\angle AEC = \angle ADC∠AEC=∠ADC, which contradicts—

In the proof, $E$ is the second intersection point of side $AD$ with the auxiliary circle through $A,B,C$ . We deduce $\angle AEC = \angle ADC$ , which contradicts—