Greg says that x = y because they’re hitting the same points? I did not understand this property, can someone please explain?
Also, do we not care if the lines are parallel or not and if the intersection point is the centre or not?
Can you check out this video?
Maybe we can apply it here?
It’s inscribed angle theorem. In particular, they’re both inscribed angles subtended by the same arc (in this case arc AB) and thus they’re equal.
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