i'm not good at explaining stuff but if you need an answer i'm here for you.
Answer from: Quest
∠acb = 8°
step-by-step explanation:
∠xba lies on the circle and is half the measure of the intercepted arc ax
hence
measure of arc ax = 2 × 42° = 84°
∠acb is outside the circle and is
∠acb = (arcab - arcax ), hence
∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°
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