Lines r and s are parallel. Find the measure of ∠1.

m∠8 = 65°

∠8 and ∠7 are supplementary, so 180° - 65° = ∠7.

∠7 and ∠5 are supplementary, so 180° - 115° = ∠5.

∠3 and ∠5 add to 180°, so

180° - 65° = ∠3.

180° - 65° = ∠3.

∠3 and ∠1 are supplementary, so 180° - 115° = ∠1.

180° - 65° = 115°

180° − 115° = 65°

180° − 65° = 115°

180° − 115° = 65°

m∠1 = 65°