Circle Around a Triangle
Click on the 5th tab with picture of triangle. Then select "Polygon". Mark 3 points and you will draw a triangle.
Find the circumcenter by constructing the perpendicular bisectors.
Mark the circumcenter by finding the intersection of the perpendicular bisectors.
Draw a circle around the triangle.
Click on the circumcenter as the center of the circle. [br]Then click on one of the vertices of the triangle.
We say "The circle is circumscribed about the triangle".
You should end up with a circle that is around the triangle and passes through all three of the vertices of the triangle.[br][br]Why do you think the circle passes through all three of the vertices of the triangle?[br][br]