Open AlgebraView and GraphicsView under View in Menu.
2.
Make a triangle with the vertices , and by clicking Polygon. Then you need to click on three positions in GraphicsView where you want the vertices of the triangle to be. Finally, complete the triangle by clicking on the point that you started with.
3.
Click on PerpendicularBisector by first clicking tool number 4, then tool number 3 in the drop-down list.
4.
Construct the perpendicular bisector of , the perpendicular bisector of and the perpendicular bisector of by clicking on the sides of .
5.
Click Intersect by first clicking tool number 4, then tool number 4 in the drop-down list, and use it to find the point of intersection of two perpendicular bisectors. The point is the circumcenter.
6.
Click CirclewithCenterthroughPoint to construct a circle with the circumcenter as the center, and one of the vertices of the triangle as the point. You will see that the circle actually touches all vertices even though you just clicked one corner. You’ve drawn the circumcircle!
. Then you need to click on three positions in 
by first clicking tool number 4, then tool number 3 in the drop-down list. 
by first clicking tool number 4, then tool number 4 in the drop-down list, and use it to find the point of intersection of two perpendicular bisectors. The point is the circumcenter. 
to construct a circle with the circumcenter as the center, and one of the vertices of the triangle as the point. You will see that the circle actually touches all vertices even though you just clicked one corner. You’ve drawn the circumcircle! 
