Three angles of a quadrilateral are 100°, 70°, & 80°find the fourth angle.
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according to the angle sum property of the quadrilateral
the sum of all the angles of a quad is 360 degree
angle 1 +angl2 + angle 3 +angle 4 = 360 degree
100 degree + 70 degree + 80 degree + angle 4 = 360 degree
250 degree + angle 4 = 360 degree
angle 4 = 360 degree - 250 degree
angle 4 = 110 degree
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