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Which of these CANNOT be the set of angles of a triangle?

Class 7Angle Sum PropertyTriangles
  • A30°, 60°, 90°
  • B20°, 70°, 90°
  • C20°, 80°, 80°
  • D33°, 33°, 33°

Step-by-Step Solution

33 + 33 + 33 = 99°, not 180°, so it cannot form a triangle. The others all sum to 180 deg (30+60+90, 20+70+90, 20+80+80).
Answer: D) 33°, 33°, 33°

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