[br]1) Use the "Polygon" tool to create ΔBCD[br][br]2) Use the "Angle" tool to measure all three angles of the triangle[br][br]3) Use the "Distance or Length" tool to measure all three sides of the triangle[br][br]4) Draw segment AD[br][br]5) Use the "Distance or Length" tool to measure segments BD, DC, CB and AD. You will need to select the endpoints of each segment in order to find the lengths[br][br]6) Move point D along the circle, and see if you notice any invariants