Points XXX, Y Y\,Y and Z Z\,Z are points on the circumference of a circle, centre OOO. WZV WZV\,WZV is a tangent to the circle at point ZZZ.
XY=YZXY = YZXY=YZ Angle YZV=49∘YZV = 49^\circYZV=49∘
Find the size of angle XOZXOZXOZ.
You must show all your working.
