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I don't get exactly what it is asking for you to tell it, but I can tell you that all three of those triangles are exactly the same. They're congruent. What does it want you to tell it?
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Okay, I'll help, just give me a minute to write this out. I'm also helping other people so please give me a minute.
Okay, I got it. This is really hard to explain but I will do my best. First off, do you see where all three triangles meet in the first picture? Look at the blue and red at that vertex point. Those two angle together is the same of Angle DAB.
Do you follow me so far?? That is why Angle C + Angle B = DAB because if you look in the first picture, they are congruent pieces. Try to look at them and see if you can tell what I'm talking about. If you're still confused feel free to ask any questions.