Answer:
4cm + 2.8cm +4cm = 10.8 cm
Step-by-step explanation:
Formula Perimeter is A+B+C
First, you need to change the 28 mm to cm (move decimal once space to the left making 28mm to 2.8 cm)
Next, add all your sides that are now in the same format of cm
4 +2.8 +4=10.8 cm
