Koliko iznosi zbroj mjera kutova $\alpha$$\alpha$ i $\beta$$\beta$ sa skice?

Središnji kut nad tetivom: $360^{\circ} - 220^{\circ} = 140^{\circ}$$360^{\circ} - 220^{\circ} = 140^{\circ}$.\nPripadni obodni kut: $\frac{140^{\circ}}{2} = 70^{\circ}$$\frac{140^{\circ}}{2} = 70^{\circ}$.\nIz zbroja kutova četverokuta: $\alpha + \beta + 220^{\circ} + 70^{\circ} = 360^{\circ}$$\alpha + \beta + 220^{\circ} + 70^{\circ} = 360^{\circ}$, slijedi $\alpha + \beta = 70^{\circ}$$\alpha + \beta = 70^{\circ}$.\nOdgovor: B