Problem 314: Tangent
circles, Common external tangent line, Geometric Mean
Online Math. Activate Flash plug-in or JavaScript and reload to view the Tangent circles, Common external tangent line, Geometric Mean,
Online Learning.
The figure shows circles A (radius a)
and B (radius b) tangent at E. A common tangent line is tangent
to the circles at C and D, respectively. Prove that CD is twice
the geometric mean of a and b.
Post
a
comment.
