Answer:
X=140
Step-by-step explanation:
Firstly, any Quadrilateral has a total sum of its angle equal to 360 degrees
The attachment you are showing us shows that we already know two angles
(70)&(60) degrees. I am assuming the line DC is a tangent, so angle ADC must be 90 degrees since a full angle on a tangent is equal to 180 degrees and there is 90 from the other side (180-90=90). Now we know 3 angles and what you have to do is find X so that when you add them all up they make a sum of 360.
X+70+60+90=360
X=360-70-60-90
X=140
