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प्रश्न
Can all the four angles of a quadrilateral be obtuse angles? Give reason for your answer.
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उत्तर
All the four angles of a quadrilateral cannot be obtuse angles.
Justification:
We know that,
Sum of all angles of a quadrilateral = 360°
So, at least one angle should be acute angle.
Hence, all the four angles of a quadrilateral cannot be obtuse angles.
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