A hexagon:-
Interior angles add up to 720 degrees
Exterior angles add up to 360 degrees
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-- Measure, calculate, or somehow get the measure of each interior angle. -- Add them all up to get one number which is their sum. -- That one number is the sum of the interior angles.
Angles that have a measure sum of 90.
The third angle is 85 degrees. The sum of all internal angles in a triangle is always 180 degrees
The sum of all angles in any triangle equals 180 degrees.
supplementary angles.