5.3N + 7.25 = 70.85 what is N
2 answers:
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<span>Three spheres are tangent to a plane at the vertices of a triangle and are tangent to each other. Denote the points where spheres are tangent to the lane A, B, C. You get a triangle ABC with lengths of sides 6, 8 and 10. Denote 
the projections of the tangent points between spheres on the pane</span>.
Then
and
.
Add all these three equations:
and substract each equation from 
:
.
Then
are spheres' radii.
Then
and
Add all these three equations:
Then