[MEDAL & FAN] Are these two triangles similar? How do you know?

Question

anonymous · Answer

attachment

anonymous · Answer

I understand they are similar but can someone give me why they are similar?

anonymous · Answer

seems like they are same

anonymous · Answer

a triangle has 180 degrees in total

anonymous · Answer

do you anything about the sides?

anonymous · Answer

Yes I already know that a triangle equals 180 degrees. But if your saying they're equal. What makes them equal? why are they equal?

anonymous · Answer

do you know anything about the sides?

anonymous · Answer

No. thats all the info they gave me

anonymous · Answer

@Directrix Please help :)

anonymous · Answer

the reason why I asked it because ff an angle of one triangle is congruent to the corresponding angle of another triangle and the lengths of the sides including these angles are in proportion, the triangles are similar.

anonymous · Answer

@TheSmartOne

thesmartone · Answer

http://prntscr.com/69bcy4 So you know vertical angles are equal :) Verticle angles are like |dw:1424801291401:dw|

thesmartone · Answer

And another angle that would be congruent is 
|dw:1424801367069:dw|

anonymous · Answer

So both angles would be 42 degrees? @TheSmartOne sorry im not good with this

thesmartone · Answer

|dw:1424802229524:dw|