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    I have the answer but I wondered why they needed to sate 'Angle PBA + Angle APB = 3x+40'?Name:  Screenshot 2018-02-15 at 16.26.11.png
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    please.
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    please, please.
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    please, somebody?
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    They just added that because they want to show you what they did to get the 3x+40. You could just show you added the angles but they just wrote it in that way.
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    I haven't looked at properly but I think its because angles in a triangle add up-to to 180 degrees right?
    So those two angles in the triangle plus the last angle in triangle adds up to 180.
    So to find the last angle you would do 3x+40-180= (the last angle in triangle)
    angles on a straight line add up-to to 180 degrees and the last angle in triangle lies on a straight line (along with the angle outside the triangle)

    So do the last angle in the triangle - 180 to find the angle outside the triangle
 
 
 
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