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Sum of the 4 angles of a quadrilateral = 360 degrees

sum of the given three angles 60, 75, 100 is equal to 235

∠1=60° ∠ 2=75° ∠3=100° let ∠4=x since the sum of all interior angles of a quadilateral=360° ATQ 60° + 75° + 100° + x = 360° 235° + x = 360° x = 360° - 235° x = 125°

FINDING THE EXTERIOR ANGLES- linear pair = 180° ∠1=60° ∴ exterior ∠1 = 180° ⁻ 60° = 120° ∠2 = 75° ∴ exterior ∠2 = 180° - 75° = 105° ∠3 =100° ∴ exterior ∠3 = 180° - 100° = 80° ∠4 = 125° ∴ exterior ∠4 = 180° - 125° = 55° as we know that the sum of exterior angles of a quadilateral equal to 360° thus, 120° ⁺ 105° + 80° + 55° = 360°

ps.- you can completely rely on this answer. happy to help. :))

my answer gave you the complete information whereas the answer you marked as the best didnt tell how to find the 4 exterior angles! and still you chose it as the best one!!