The exterior angle obtain on producing The base of triangle both ways are angle 100 degree and angle 20 degree find all angles of triangle
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angle 1 = 100 degrees
angle 2 = 20 degrees
angle 2 = 20 degrees
addy6204:
then angle 3 +100+20 =180
then angle 3 = 180 - 120
therefore angle 3 = 60 degree
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