Розрахунок: j2h9qZ - 1

d_₁^²+ d_₂^² =
4* a^²

d_₁^²+ d_₂^² = 4* a^² $d_{1}^{2}+d_{2}^{2}$ = $4\cdot a^{2}$

d_₁^² = 4* a^²- d_₂^² $d_{1}^{2}$ = $4\cdot a^{2}-d_{2}^{2}$

d_₁ = saknis(

4* a^²- d_₂^²) $d_{1}$ = $\sqrt {4\cdot a^{2}-d_{2}^{2}}$