Find the missing dimension. Use the scale factor 1 : 12.
Item Model Actual
Football helmet Diameter: mm Diameter: 21 cm

17.5 mm

Step-by-step explanation:

First, you need to find out what number times 12 equals 21. To do that, you simply solve 21 divided by  12, which equals 1.75 cm. Since you want the answer in mm, you multiply 1.75 by ten because one cm = 10 mm

Hope that this helps! (:

ik how do do this just give me a few minutes and i will give it to

hi,

i'm 75% sure the answer is 1,1 to both lines.

have a great day