Four spheres with radii a,b,c and d
touch each other. Find the radii of
their circumscribed sphere (R) and
their inscribed sphere (r) in terms of
a,b,c and d.
To this formula find the value of S when t=1 u=2 a=3 b=4 c=5
S=((tu)/((a+b+c)))
[Answer]=========================
S=0.1666666666666...
≈0.17
[Solution]========================
[S=((tu)/((a+b+c)))]
=((1×2)/((3+4+5)))
=(2/((3+4+5)))
=(2/((7+5)))
=(2/(12))
=0.1666666666666...
≈0.17
S=0.17