Discussion Question 1 (Group 2)

An archaeologist uncovered a fragment of a circular plate (as shown below) used by an ancient civilisation.

He was curious and wanted to know the size (i.e. radius) of the plate that he found. He approached his Mathematician friend for help. In no time, his Mathematician friend quickly worked out the size (i.e. radius) of the plate for him. The archaeologist was amazed.

Do you know how the Mathematician friend did it? Can you explain his method?
You may want to explore around using the GeoGebra applet below.

Hint : Which "Property of Circle" helps us to locate the centre of a circle?



Download the GeoGebra file: http://www.geogebratube.org/material/download/format/file/id/42704