Stage: 3 Challenge Level: 
 |
Semi-circles are drawn on $AB$, $AC$,
$BD$ and $CD$ where $AB = BC = CD$
Show that the large circle is divided into $3$ portions of equal area. |
Creating expressions/formulae. Pythagoras' theorem. Squares. Generalising. Visualising. Area. Short problems. Arcs, sectors and segments. smartphone. Circles.
Published February 1998.
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