Расчет: JG6tgd - 1

c^² =
a^²+ b^²- 2* a* b* cos(α)

c^² = a^²+ b^²- 2* a* b* cos(α) $c^{2}$ = $a^{2}+b^{2}-2\cdot a\cdot b\cdot cos(\alpha)$

c = saknis(

a^²+ b^²- 2* a* b* cos(α)) $c$ = $\sqrt {a^{2}+b^{2}-2\cdot a\cdot b\cdot cos(\alpha)}$