Answer:
A. 140
Explanation:
We have been given an image of a circle. We are asked to find the value of z.
Upon looking at our given circle we can see that z is the intercepted arc to the inscribed angle that measures 70 degrees.
We know that measure of intercepted arc of a circle in two times the measure of inscribed angle.
Using inscribed angle theorem we can set an equation as:
Therefore, the value of z is 140 and option A is the correct choice.