A right angle because 180* - 90* is 90* which is a right angle !
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360 degrees take away the internal angle
A straight angle is defined as 180 degrees.If you didn't know that, you could take two of them and place them adjacent, or "back to back", and see that they add up to a full 360 degrees.
Hint: 180 take away 70... 180o - 70o = 110o
90.
take away the interior angle adjacent to it from 360