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< 1 is supplement to < 2 means that both angles have to add up to 180°.
< 1 = 115°
180° - 115° = 65°
< 2 = 65°
< 2 is complement to < 3 means that both angles have to add up to 90°.
90° - 65° = 25°
< 3 = 25°

Answer:
< 2 - < 3 is 65° - 25° = 40°

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