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The diagonals of a rhombus are perpendicular: . .[C]Given: rhombusCode:A * - - - - - - - - * B / * * / / * E * / / * / / * * / / * * / D * - - - - - - - - * C

. . . Opposite angles of a parallelogram are equal.

The diagonals of a rhombus bisect the vertex angles.

. . Therefore: . .[B}

is an isosceles triangle.

. . Therefore: . .[B]

. . . Adjacent angles of a parellelogram are supplementary.

The diagonals of a rhombus bisect the vertex angles.

. . Therefore: . .[A]