Given that is a rhombus and is a rectangle, where cm, cm, and cm, find the area of the shaded part.
Step 1: Find the area of the rectangle.
The width of the rectangle is the same length as : .
Step 2: Find the area rhombus.
Use the formula for the area of a rhombus using its diagonals.
Step 3: To find the area of the shaded part, subtract the area of the rhombus from the area of the rectangle.