There are an infinite list of different sets of angles that an isosceles triangle
can have. All you know about them is:
-- two of them must be the same size
-- all three of them must add up to 180 degrees.
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The angles of a triangle always add up to 180o. A right angle triangle has angle of 90o, 60o, 60o.
The inner angles of a triangle add up to 180 degrees. 180 - (70 + 30) = 80 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
180 degrees because the 4 interior angles of a quadrilateral add up to 360 degrees and the 3 interior angles of a triangle add up to 180 degrees
A right angle triangle has a 90 degree angle and two acute angles whereas altogether the three angles add up to 180 degrees.