In the adjoining figure lines L & M intersects at O. If ∠1+ ∠3 =2220then find the measure of ∠2+ ∠4.
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since ∠1+ ∠3=222°
therefore ∠1+ ∠3+∠4+∠2= 360°
then. ∠1+3 - ∠1,2,3and4
which is 222°-360°=138°
therefore ∠2+4=138°
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