the sum of the measures of the two angles is that of a straight angle if one of them is acute angle then the other should be
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as one of the angle is acute.
( the angle be X let the other angle be y)
so x<90°
180+x<180°+90°
180-90<180-x
90<y
y>90°
so the other angle is obtuse angle
( the angle be X let the other angle be y)
so x<90°
180+x<180°+90°
180-90<180-x
90<y
y>90°
so the other angle is obtuse angle
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