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A right angled triangle cannot have one angle of 32 degrees and another of 52 degrees. The two MUST sum to 90 degrees. Furthermore, information about the three angles is not sufficient to calculate any length for the triangle. You must know the length of at least one line - a side, an altitude or a median.
'a' and 'b' must both be acute, complementary angles.
A parallelogram cannot have just one right angle. If it has one, all four of its angles must be right angles and so it must be a rectangle (or, as a special case, a square).
An isosceles right triangle has an angle of 900 and two sides of equal length and two equal angles. Therefore other two angles must be 450.
A obtuse angle is called an obtuse angle because if obtuse means bigger in degrees and a right angle is 90 degrees than a obtuse angle must be over 90 degrees.