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Answer :

DᴀʀᴋPᴀʀᴀᴅᴏxgo

Let the missing Angle be " x "

We know that Measure of an exterior angle of a triangle is equal to sum of the opposite two interior angles,

that is :

  • x + 80° = 100°

  • x = 100° - 80°

  • x = 20°

value of missing angle = 20°

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