In circle1.jpg,

DB is a diameter of the circle, AC = BC and ∠DAC = 23∘ .

Find ∠ABD.

In circle2.jpg,

AD is the diameter of the circle

If AB = BC = CD, find x + y + z.

In circle3.jpg,

In the figure XAB and XDC are straight lines. If DX = 5, AX = 6 and AB = A, Find CD

Can anyone give me some idea please?

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