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Question Number 80682 by ajfour last updated on 05/Feb/20

Commented by ajfour last updated on 05/Feb/20

$I f b o t h c o l o u r e d a r e a s a r e e q u a l,$ $f i n d r .$
Commented by ajfour last updated on 05/Feb/20

$f i n e s i r, t h a n k s; i s h a l l t r y a n d$ $c h e c k m y a n s w e r w i t h y o u r s,$ $o n l y p r o b l e m, m y c a l c u l a t o r$ $i s n o t r e l i a b l e . .$
Commented by MJS last updated on 05/Feb/20

$I found no exact solution . the integrals lead$ $to$ $2 r^{2} \arcsin \frac{2 r^{2} - 1}{2 r^{2}} - 2 \arccos \frac{1}{2 r} + \sqrt{4 r^{2} - 1} = 0$ $\Rightarrow r \approx . 863014954138$
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