Расчет: YtEBkv - 1

R =

a* b* c

/ 4

* S

R =

a* b* c

/ 4

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

R =

S* a* b* c

/ 4

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

R = 0.25* S* a* b* c $R$ = $0.25\cdot S\cdot a\cdot b\cdot c$