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    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? :/
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    (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? :/
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    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
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    (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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