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No. In fact, they never are. A right angle by definition is 90 degrees. An obtuse angle is any degree greater than 90. In order for two angles to be supplementary, they must equal 180 degrees. Because an obtuse angle is always greater than 90 degrees, and a right angle is always 90 degrees, an obtuse angle and a right angle can never be supplementary.
nope, never. think about it, if the angles of a triangle always add up to 180 degrees, a right triangle is 90 degrees, and an obtuse angle is over 90 degrees. anything over 90 degrees plus 90 will exceed 180 degrees. Actually you can on a sphere
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Nope. It is complementary angles that add to 90 degrees.
always 90 degrees