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If m<3=105, what is the m<21 that will prove that lines P and R are parallel. please help

If m<3=105, what is the m<21 that will prove that lines P and R are parallel-example-1
User Ying Xiao
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1 Answer

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Answer: 75°

have: m∠3 = m∠11 = m∠22 = 105°

but m∠22 + m∠21 = 180°

=> m∠21 = 180° - 105° = 75°

Explanation:

User EvensF
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