22. One side of a rhombus is equal to the leg of an isosceles right triangle. If one angle of the rhombus is $60^{\circ}$, then the ratio of the area of the rhombus to the area of the isosceles right triangle is ( ).
(A) $\sqrt{3}: 2$
(B) $\sqrt{3}: 1$
(C) $1: \sqrt{3}$
(D) $\sqrt{3}: 4$
22. B.

Let the side length of the rhombus be $a$, and the areas of the rhombus and the isosceles right triangle be $S_{1}$ and $S_{2}$, respectively. Then
$$
S_{1}=a^{2} \sin 60^{\circ}=\frac{\sqrt{3} a^{2}}{2}, S_{2}=\frac{a^{2}}{2} .
$$