WHY is the measure of an inscribed angle in a semicircle 90°?

It would be VERY helpful if this was answered ASAP!!!  And please be sure to say WHY it is 90°.
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1 Answer

??????????? "wot is the measure av a inskribed angel" ??????????

yu must meen angel???

RONG..semiserkel=half serkel, so angel=180 deg
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