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Member advised to use the homework template for posts in the homework sections of PF.

https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-xpa1/v/t1.0-9/13529050_1033411326734648_2364124398862717743_n.jpg?oh=991ce9f095c712dd7789ce0819be581e&oe=58016FFA&__gda__=1475707536_89e5606d703064d4c1ccd2e87d665c1b

are these alternate interior angle or exterior angle? is it just because of mathematical rule of geometry or what makes these angle equal?

are these alternate interior angle or exterior angle? is it just because of mathematical rule of geometry or what makes these angle equal?