Which reason justifies the statement that m

Question

Which reason justifies the statement that m<DAB

 is 100°

jhonyy9 · Answer

can you post an image too ?

anonymous · Answer

|dw:1454882863109:dw|

anonymous · Answer

I draw

misssmartiez · Answer

As you can infer from the image, it is obtuse, so it would be over 90 degrees, that is one way.

jhonyy9 · Answer

ok 

so m< EAD there given =80 - yes ? so the opposite angle to this <EAD is 80 too

so you know that 80+80=160 and that a polygon like this has the sum of angles 360 degree  so 360-160=200 but there are again angle DAB and angle EAC what mean that you need divide the resulted 200 by 2 = 100 what mean that angle DAB is equal angle EAC and m<EAC = m<DAB = 100°

hope you understand it sure right easy

misssmartiez · Answer

Another way is that you see the adjacent angles? Its 80 degrees right? (left and right), acute angles, so what can you infer by this? (You already know that the right and left angles equals 80 degrees). In other words, Johny clarified.