please help, it's geometry.
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Step-by-step explanation:
∠15 = ∠13 (vertical ∠s)
∠13 = ∠5 (corresponding ∠s)
∠15 = ∠5 (transitivity)
180 - ∠5 = ∠2 (same side interior angles are supplementary)
180 - ∠15 = ∠2 (transitivity)
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