Question

Find the angle measure a
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Answer 1

The sum of quadrilateral is 360°

So, let consider the unknown number be x.

A/C:-

☞x+90+25+110=360°

=>x=360°-225°

=>x=135°

The value of x is 135°

Answer 2

$\textsc{sum \ of \ angles \ of \ a \ quadrilateral = 360}\\\\\textsc{x + 90 + 25 + 110 = 360}\\\\\textsc{x + 225 = 360 }\\\\\textsc{x = 360-225 = 135 }\\\\\textsc{hope \ it \ helps\ !!}$