Proof: as the measure up of an inscribed angle is equal to half the measure up of the intercepted arc, the inscribed angle is fifty percent the measure up of that is intercepted arc, that is a right line. As the arc\"s measure up is $180^\\circ$, the enrolled angle\"s measure up is $180^\\circ\\cdot\\frac12 = 90^\\circ$.$\\blacksquare$

When I checked the systems on the web there to be a whole bunch of other more complex proofs. Is mine valid? If that is invalid, could someone tell me why?

Thank you,

Paul


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Hint

Draw the radius from the facility of the circle to the allude that girlfriend think it has an edge of $90$ degrees and write under the angles:

$2(x+y)=180$

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