Use the Graphing tool to inscribe a circle in the triangle. Follow these steps to inscribe a circle and find its radius:

Use the Angle Bisector tool to bisect each angle. Select three points so that the vertex is the middle point.
Use the Intersect tool to plot the incenter. Click directly on the intersection.
Use the Perpendicular Line tool to draw a line from the incenter perpendicular to any side. Select the incenter, and then select a side.
Use the Intersect tool to plot the point where the perpendicular line intersects the side.
Use the Circle tool to draw the inscribed circle. Select the center of the circle and then a point on the circle.
Use the Distance tool to determine the radius of the circle. Select the endpoints of the segment. A:(0,1) b (0,5) c (8,3)