The sum of the interior angles of a triangle is 180o. In an isosceles triangle two of the angles are the same, say x. The third angle is then 180o-2x.
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That's an isosceles triangle.
An isosceles triangle has two equal angles and one different angle. The sum of the angles in any triangle is always 180 degrees. Therefore, the two equal angles in an isosceles triangle must add up to 180 degrees minus the different angle. So, each of the two equal angles in an isosceles triangle measures (180 - x) / 2 degrees.
Presumably it is an isosceles triangle where the two equal angles are 35 degrees each and the other angle is 110 degrees (180 degrees in a triangle)
The sum of all angles in a triangle is 180 degrees. with 90 degrees (the right angle) spoken for, that leaves 45 degrees each for the remaining two angles.
20 degrees and the two equal angles will be 80 degrees each