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प्रश्न
Define a triangle.
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उत्तर
A plane figure bounded by three lines in a plane is called a triangle. The figure below represents a ΔABC, with AB, AC andBC as the three line segments.
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संबंधित प्रश्न
In a ΔABC, if ∠A = 55°, ∠B = 40°, find ∠C.
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[Hint: CN is normal to the mirror. Also, angle of incidence = angle of reflection].
