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-- The sum of the four exterior angles is 360 degrees. -- The sum of the four interior angles is also 360 degrees. -- So the sum of all the interior and exterior angles is 720 degrees.
The interior angles of a triangle all add up to 180 degrees.
-- 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.
The sum of the interior angles is 360.
Yes, the sum of all the three interior angles of a triangle is 180o.