B
F
D
E
A, B, C and D are points on the circumference of a circle, centre O.
FDE is a tangent to the circle.
(a) Show that y-x=90
You must give a reason for each stage of your working.

B F D E A B C and D are points on the circumference of a circle centre O FDE is a tangent to the circle a Show that yx90 You must give a reason for each stage o class=


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