Subject: Geometry Name: Rebecca
Who is asking: Student
Question: Use formulas for area together with the fact that ABC is split by CD into two triangles that are both similar to ABC. One nice area formula here is rs = ch/2 (where s is the semiperimeter  s = (a+b+c)/2  and h = CD). The similar triangles give you r1/r = b/c and r2/r = a/c. Cheers,Chris
