Please explain question 12

Please explain question 12 the adjoining 22 55" in suppor± of y cm

Dear student,
12) We have,2=125°then, 1+2=180°     --[linear pair]1+125°=180°  1=180°-125°1=55°Now, 1=5=55° also they form the pair of corresponding anglesHence lm
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