HOW TO USE THIS APPLET

The graph area

• Drag any highlighted location on the circle to move that location along the circle.
• Drag any non-highlighted location on the circle to change the radius of the circle.
• Drag the center of the circle to re-position the circle.
• Shift-drag the center of the circle to re-position the circle horizontally or vertically.

Other

• Use the "SHOW CENTRAL ANGLE" button to change to three highlighted locations along the circle showing the relationship between one inscribed and one central angle subtended by the same arc.
• Use the "HIDE CENTRAL ANGLE" button to change to four highlighted locations along the circle showing four inscribed angles and the relationships between them.
• Use the "POP-UP" menus to change the name of a label.
• Use the "RESET" button to restore the applet to the initial state.

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