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7 cards from this deck
180°180°180°
Subtract sum of 2 known angles from 180°180°180°
Angle formed when one side of triangle is extended
Sum of two opposite interior angles
70°70°70° (since 180°−50°−60°=70°180° - 50° - 60° = 70°180°−50°−60°=70°)
110°110°110° (since 40°+70°=110°40° + 70° = 110°40°+70°=110°)
Every triangle, no matter what kind
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