The value of the angle within the quadrilateral inscribed the circle is 142°.
Let suppose that quadrilateral is a parallelogram. Then, the following conditions must be fulfilled:
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In addition, if we have a rhombus we have the additional condition as A, B and C lie on the circle:
(4)
If we know that , then the value of .
Based on all these finding, we conclude that the value of the angle within the quadrilateral inscribed the circle is 142°.
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