Расчет: yiDRrT - 1

S =

a* b* c

/ ( 4* R)

S =

a* b* c

/ ( 4* R)

$S$ = $\frac{a\cdot b\cdot c}{4\cdot R}$

S =

a* b* c

/ 4/ R

$S$ = $\frac{a\cdot b\cdot c}{4\cdot R}$

S =

0.25* a* b* c

/ R

$S$ = $\frac{0.25\cdot a\cdot b\cdot c}{R}$