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The exterior angles of any polygon add up to 360.
the angle measures of a quadrilateral must equal 360 degrees so you add 80+140+55=275 then subtract from 360. the answer is 85
77. The sum of the three angles in a triangle equal the sum of 180 degrees
All angle sum to 180 degrees. Take 70 from this which leaves 110 degrees. The base angles must be equal so halve this number. Base angles are 55 degrees.
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.