Think about the circles and cogruent arcs .
Use the properties of a cyclic quadrilateral
Think about the linear pair property and relate it with radii of the same circle.
Think about the theorem of angles subtended in the same segment.
If you move away from the centr do the lines getting smaller or longer ?
The longest chord of the cicle pass through the circle
Use the properties of circle and the theorem angles opposite to equal sides are equal.
Think about the equidistant property of circles and try to draw the diagram.
Think about the propeties of chords of a circle and try to draw the diagram.
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