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The sum of all interior angles in a polygon is
180(n-2), where n = sides, well, this is a QUADrilateral, so it has 4 sides, so the total is 360°.
now, let's find what angle C is first,
now, recall the "inscribed quadrilateral conjecture", where opposite angles are "supplementary angles", thus
180(n-2), where n = sides, well, this is a QUADrilateral, so it has 4 sides, so the total is 360°.
now, let's find what angle C is first,
now, recall the "inscribed quadrilateral conjecture", where opposite angles are "supplementary angles", thus
Use the rational root theorem:
The dividers of
The dividers of
Therefore, check the following rational numbers: +-
Compute
Cancel the common factor: