In a quadrilateral if three angles are 90°, 60° and 70° respectively then the fourth angle is =
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140°
sum of opposite angle of quadrilateral is 180° .
A quadrilateral consists of 2(180°)s.
which means whole angle of quadrilateral is 360°.
Three angles that are-
90°,60°and 70° will be subtracted from 360° to get the fourth angle
:. 360° -(90+60+70)°
= (360-220)°
=140°
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