Answer:
= 67°
Explanation:
As we can see in the diagram, ∠ and the 78° angle together make up the 145° angle.
∴ + 78° = 145°
⇒ = 145° - 78°
⇒ = 67°
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= 67° and the 78° angle together make up the 145° angle. + 78° = 145° = 145° - 78° = 67°