Hey I need help with this new concept. Could someone help me out? I would prefer an explanation for one of the shapes if possible. Thanks!

Step-by-step explanation:

set the equation for the area equal to the equation of the perimeter.

Then solve for x

Figure a

area = perimeter

3x = 2(x + 3)

Distribute

3x = 2x + 6

subtract 2x from both sides

x = 6

perimeter

p = 2(x + 6)

p = 2(3 + 63)

p = 18

Area

a = 3x

a = 3*6

a = 18

Use the same method on the remaining figures

The exact answer would be 7.5.

So 7.5 as a ratio would be 7/5, or 1 whole and 2 parts I think. Sorry if I'm wrong.