How to calculate the perimeter of the whole patch of 4cm, 2cm, 6cm, 10cm, 2cm, 2cm, 2cm,120mm and 8cm?

To calculate the perimeter of the whole patch, you need to add up the lengths of all the sides.

Convert all measurements to the same unit (centimeters):
- 120mm = 12cm

Now, add up all the lengths:
4cm + 2cm + 6cm + 10cm + 2cm + 2cm + 2cm + 12cm + 8cm = 48cm

Therefore, the perimeter of the whole patch is 48cm.

First, convert 120mm to centimeters:

120mm = 120mm x (1cm / 10mm) = 12cm

Now, we can calculate the perimeter by adding the lengths of all sides:

Perimeter = 4cm + 2cm + 6cm + 10cm + 2cm + 2cm + 2cm + 12cm + 8cm
= 46cm

Therefore, the perimeter of the whole patch is 46 centimeters.