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mumsy

Answer:

Step-by-step explanation:

for a triangle inscribed in a semicircle that angle is always 90 degrees

sqdancefan

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Answer:

  C.  90°

Step-by-step explanation:

A triangle inscribed in a semicircle is always a right triangle. The measure of angle Y, which subtends an arc of 180°, is half the measure of the arc it subtends, so is 180°/2 = 90°.