Think about the equidistant property of chords of a circle and try to draw the diagram.

Think about the property of circles and try to draw the diagram.

The longest chord of the cicle pass through the circle

Think about the theorem of angles subtended in the same segment.

Think about the circles and cogruent arcs .

Think about the circles and try to draw the diagram.Then use theorem .

Use the properties of circle and the theorem angles opposite to equal sides are equal.

Think about the linear pair property and relate it with radii of the same circle.

Think about the circles and try to draw the diagram.

Think about the equidistant property of circles and try to draw the diagram.