Answer:
Explanation:
∡4 = ∡2, ∡4 + ∡5 = 180°,
∡5 = 180° - ∡4
Since ∡2 = ∡4:
∡5 = 180° - ∡2∡5 + ∡2 = 180° - ∡2 + ∡2∡5 + ∡2 = 180°
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