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In a quadrilateral the angles are 40°,120°,10° and x. Find x.(a) 40°(b) 120°(c) 190°(d) 180°The question was posed to me in my homework.My doubt is from Quadrilaterals in portion Quadrilaterals of Mathematics – Class 8

Answer» CORRECT choice is (c) 190°

The explanation is: A quadrilateral is a FOUR SIDED polygon. THEREFORE the SUM of all the interior angles is 360°.

Therefore 40+120+10+x=360

Therefore 170+x=360

Therefore x=190.


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