Which of the following cannot be the measure of three angles of a triangle?

∠A = 60°, ∠B = 60°, ∠C = 60°

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∠A = 70°, ∠B = 20°, ∠C = 100°

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∠A = 90°, ∠B = 90°, ∠C = 90°

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∠A = 72°, ∠B = 30°, ∠C = 78°

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Solution

The correct options are
B
∠A = 70°, ∠B = 20°, ∠C = 100°

C
∠A = 90°, ∠B = 90°, ∠C = 90°

Sum of all the angles of a triangle should be equal to 180°.

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