Sebenzisa irula ukumela ipherimitha yamabumbeko alandelako. Tiola ipendulakho ngamamlimitha.

• Ihlangoithi 1 (Length): $4.0 \text{ cm}$
• Ihlangoithi 2 (Width): $2.0 \text{ cm}$
• Ihlangoithi 3 (Length): $4.0 \text{ cm}$
• Ihlangoithi 4 (Width): $2.0 \text{ cm}$

The perimeter of Shape 1 is $\boxed{\text{120 mm}}$.

Shape 2: Triangle
Example Measurements:
Let's assume the triangle is equilateral with each side measuring $3.5 \text{ cm}$.

• Ihlangoithi 1: $3.5 \text{ cm}$
• Ihlangoithi 2: $3.5 \text{ cm}$
• Ihlangoithi 3: $3.5 \text{ cm}$

The perimeter of Shape 2 is $\boxed{\text{105 mm}}$.

Shape 3: L-shaped Polygon
Example Measurements:
This shape has 6 sides. Let's assume the following measurements:

• Side 1 (Top horizontal): $2.0 \text{ cm}$
• Side 2 (Right vertical): $4.0 \text{ cm}$
• Side 3 (Bottom horizontal): $4.0 \text{ cm}$
• Side 4 (Left vertical): $2.0 \text{ cm}$
• Side 5 (Inner horizontal): $2.0 \text{ cm}$
• Side 6 (Inner vertical): $2.0 \text{ cm}$

The perimeter of Shape 3 is $\boxed{\text{160 mm}}$.

Shape 4: Rhombus/Square
Example Measurements:
Let's assume this is a rhombus with all four sides equal, each measuring $2.8 \text{ cm}$.

• Ihlangoithi 1: $2.8 \text{ cm}$
• Ihlangoithi 2: $2.8 \text{ cm}$
• Ihlangoithi 3: $2.8 \text{ cm}$
• Ihlangoithi 4: $2.8 \text{ cm}$

The perimeter of Shape 4 is $\boxed{\text{112 mm}}$.

Here is the table with the example measurements and calculated perimeters:

Note: For Shape 3, you would measure all 6 sides and sum them up for the perimeter. The table only has space for 4 sides, so the perimeter column reflects the sum of all sides.