how to solve this with angle sum property
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The given figure is of a quadrilateral (4 sides).
The sum of interior angles of a quadrilateral = 360°
30+60+45+y=360
y = 360 - 135 = 225°
the angles x and y completes a full rotation.
which means x + y = 360
x = 360 - y = 360 - 225 = 135°
x = 135°
y = 225°
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