Расчет: 4FwoKV - 1

l =

π

* R* α

/ 180

l =

π

* R* α

/ 180

$l$ = $\frac{\pi\cdot R\cdot \alpha}{180}$

l =

R* α* π

/ 180

$l$ = $\frac{R\cdot \alpha\cdot \pi}{180}$

l = 0.00556* R* α* π

$l$ = $0.00556\cdot R\cdot \alpha\cdot \pi$