Turtle Lake School District

Let the triangle have area A and semiperimeter s. Then it is a pleasant exercise in geometry to see that . A=rs (2) and (3) where a, b, and c are the angles at the center of the circle formed by the radii perpendicular to the sides of the triangle. Figure 2: Triangle. Combining equations (2) and (3), we get (4) Let x=tan(a/2), y=tan(b/2). ................
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