$$\frac{1}{2}$$

$$\frac{1}{4}$$

$$\frac{4}{8}$$

(-1,4)

(2, 4)

(-2,3)

(1,2)

$$\sqrt {\frac{5}{2}}$$

$$\sqrt[\frac{3}{2}]{\frac{4}{4.2}}$$

$$\frac{\sqrt3}{2}$$