aatlinstewart aatlinstewart 07-02-2018 Mathematics contestada Two lines intersect at a point, forming ∠1 , ∠2 , ∠3 , and ∠4 . ∠1 and ∠2 are supplementary angles. ∠2 and ∠4 are vertical angles. m∠1=90° What is the measure of ∠4 ? PLS HELP