Calculating angle x.
Notice!
x (angle BCD) will sum up the interior reflex angle BCD of the plane shape ABCD to get 360°
Plane shape ABCD is a quadrilateral, therefore the sum of its interior angles is 360°
It implies;
30+70+20+a = 360
Where a is the interior reflex angle BCD of the plane shape ABCD.
a = 360-120
a = 240°
Therefore, x, angle BCD is;
a+x = 360
240+x = 360
x = 360-240
x = 120°
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