Answer :

Seg AB is a diameter

⇒ M (arc ACB) =180° [Angle Made in Semi circle = 180°]

⇒ M (arc AKC) +m (arc BMC) = m (arc ACB) [Arc Addition

Property]

⇒ 40+ m (arc BMC) = 180°

⇒ M (arc BMC) = 180° -40°

⇒ M (arc BMC) =140°

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