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  • 4 years ago

classify the fourth angle of a quaderadiral that has three acute angles

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  1. blockcolder
    • 4 years ago
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    If A, B, C, and D are the angles of the quadrilateral, then A+B+C+D=360. Now, we know that A<90, B<90, C<90. Thus, A+B+C<270. Therefore, D>90 and it is obtuse.

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