The angles of a triangle always add up to 180o. A right angle triangle has angle of 90o, 60o, 60o.
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A right angle triangle has a 90 degree angle and two acute angles whereas altogether the three angles add up to 180 degrees.
Using the cosine rule gives the largest angle of the triangle as 91.04179885 degrees or 91.042 degrees rounded to 3 decimal places. So: 91.042-90 = 1.042 degrees
One right angle is 90 degrees. If it's anything else, it's not a "right" angle.
The inner angles of a triangle add up to 180 degrees. 180 - (70 + 30) = 80 degrees.
90