Triangles in a CircleOn this web page you can investigate the properties of a triangle with one vertex at the center of a circle and two vertices on the circle.
Sketch
The triangle in this sketch has one vertex at the center of the circle and two vertices on the circle. Drag points A and B to change the triangle. Drag point C to change the radius of the circle. The button will help you answer question 2.
Investigate
 Are the triangles all isosceles? Explain.
 If the vertex at the center of the circle has an angle measure of 60°, what is true of the other two angles in the triangle? What kind of a triangle is this?
