To find the missing angle, use the fact that the sum of all angles in a triangle is equal to 180 degrees.
angle b + angle a + angle c = 180 degrees
angle b + 71 + 69 = 180
angle b + 140 = 180
angle b = 40 degrees
Therefore, the missing angle (angle b) is 40 degrees.
angle a= 71
angle c= 69
angle b=
What is the missing angle
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