Proof: together the measure up of one inscribed edge is same to fifty percent the measure up of that intercepted arc, the inscribed angle is half the measure up of the intercepted arc, the is a directly line. As the arc"s measure up is $180^\circ$, the inscriptions angle"s measure is $180^\circ\cdot\frac12 = 90^\circ$.$\blacksquare$

When I checked the equipment on the internet there were a whole bunch of various other more complex proofs. Is mine valid? If the is invalid, can someone phone call me why?

Thank you,

Paul


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edited Oct 29 "13 in ~ 13:26
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amWhy
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Paul FilchPaul Filch
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$\begingroup$
Hint

Draw the radius native the facility of the circle to the allude that you think it has an edge of $90$ degrees and also write down the angles:

$2(x+y)=180$

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