Question 380218
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Hi,
Let x represent the original angle, (90°-x)its complement and (180°-x) its supplement
Write as we Read***
(90°-x) + (180°-x) = 13x
solving for x
270° - 2x = 13x
270° = 15x
 18° = x

CHECKING our Answer***
72° + 162° = 234° = 13*18°