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This mathswatch isosceles triangle question watch

1. I've been working on this homework for the past week now and I'm currently on a score of 99% but there's this one question involving explaining why an isosceles triangle is an isosceles triangle that I've been unable to figure out the exact answer for. It's the only question I need to get now so I was wondering if anyone had any idea on what I'm missing out? :/
2. (Original post by dolphinlord111)
I've been working on this homework for the past week now and I'm currently on a score of 99% but there's this one question involving explaining why an isosceles triangle is an isosceles triangle that I've been unable to figure out the exact answer for. It's the only question I need to get now so I was wondering if anyone had any idea on what I'm missing out? :/
3. your way is fine but you need to explain how you know that:

the angle at B is 100 degree because 180 - 80 =100
therefore BCD has to equal 100 because alternate angles are equal
so 100 - 50 = BCA = 50
then simply 180 - 80 - 50 = 50 = BAC
4. (Original post by dpksrk2015)
your way is fine but you need to explain how you know that:

the angle at B is 100 degree because 180 - 80 =100
therefore BCD has to equal 100 because alternate angles are equal
so 100 - 50 = BCA = 50
then simply 180 - 80 - 50 = 50 = BAC
Thank you so much!

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Updated: February 21, 2018
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