HP Prime Graphing Wireless Calculator Manual de usuario Pagina 224

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Circumcircle
A circumcircle is the circle that passes through each of the triangles 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 dened 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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