
Circumcircle
A circumcircle is the circle that passes through each of the triangle’s three vertices, thus enclosing the
triangle.
Tap at each vertex of the triangle, pressing after each tap.
Excircle
An excircle is a circle that is tangent to one segment of a triangle and also tangent to the rays through the
segment’s endpoints from the vertex of the triangle opposite the segment. Tap at each vertex of the triangle,
pressing after each tap.
The excircle is drawn tangent to the side dened by the last two vertices tapped. In the following gure, the
last two vertices tapped were A and C (or C and A). Thus the excircle is drawn tangent to the line segment AC.
Incircle
An incircle is a circle that is tangent to all three sides of a triangle. Tap each vertex of the triangle, pressing
after each tap.
176 Chapter 9 Geometry
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