The perimeter of this rectangle is 20cm, what’s the missing side?

4 cm

Step-by-step explanation:

Formula for perimeter of a rectangle: P = 2(l+w)

20 = 2(6+w)

20 = 12+2w

divide by 2

10 = 6 + w

10-6 = w

4 = w

using pemdas, (order of operations) you'll see the answer is 24.

this is a good question! i'll do some research and come back when i have the answer!