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By a straight angle I assume you mean an 180° angle, so two angles that form a 180° angle would be called supplementary angles.
A right angle is 90 degrees so two right angles put together would equal 180 degrees
acute,obtuse,right angle, and straight line. * * * * * Rather than straight line I would have said a reflex angle.
Yes, for example, you have a straight horizontal line. If you intersect a straight vertical line in the middle of the horizontal line, pointing straight up, you would have two right angles.
One right angle is equal to 90 degrees, or a vertical line extending from the o degree plane. Therefore, two right angles, presumably side to side, would have 180 degrees, since together the would be supplementary angles. Supplementary angles are two angles which combine to from 180 degrees, and 90 plus 90 would equal 180 degrees. Look at angle DBE and at angle EBC. Each are 90 degree angles, or right angles, and together equal 180 degrees.