Lines a and b are parallel. what is the measure of < 8 if < 1 measures 110

a)35
b)55
c)70
d)110

Option C. m∠8=70°

Step-by-step explanation:

see the attached figure to better understand the problem

step 1

Find the measure of angle 5

we know that

m∠5=110° -----> by corresponding angles

step 2

Find the measure of angle 8

we know that

m∠8+m∠5=180° -----> by supplementary angles (form a linear pair)

we have

m∠5=110°

substitute

m∠8+110°=180°

m∠8=180°-110°=70°

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