Think about the property of angle formed by the diameter in the semi circle

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

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

Use the property of arcs that is equal arcs of a circle subtend equal angles at the centre of the circle.

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

The longest chord of the cicle pass through the circle

Think about the property of angles subtended by the circle at the centre of the circle .

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

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

Use the properties of a cyclic quadrilateral