Question

Find the angles x, y in the following circles with centre O.
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Answer 1

Answer:

X left, y right of the centre

Answer 2

Answer:

angle b is 90 ( angle in a semicircle is 90)

by angle sum property,

X= 60

and

angle D = 90

angle c = angle y

2y + 90 = 180

2y= 90

y= 45