Question

if 3 angles of a quadrilateral are 100 degree, 75 degree and 105 degree then the measurement of fourth angle is ???
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Answer 1

We know that sum of four angle of quadrilateral=360°

=>100°+75°+105°+x=360°

=>175°+105°+x=360°

=>280°+x=360°

=>x=360°-280°

=>x=80°

Therefore,the measurement of fourth angle is 80°