Calculating angles with circles

This task is about the angle between a tangent and a radius, and the sum of angles in a triangle and the sum of angles in a quadrilateral. 
Complete the following sentences by finding the size of the marked angles.  
In each case, justify your answer.  
The centre of each circle is marked with a dot.

Question 1Change answer

a)
Calculating-tangent-circle-diagram-i.png [Not drawn to scale]
Angle t =  ° because ...
   
Angle u =  ° because ...

Question 1Change answer

b)
diagram of a angles and a circle [Not drawn to scale]
Angles y + z =  °
Angle x =  ° because ...
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