Answer:

Step-by-step explanation:
I may be wrong when I say this, but it is impossible to find the radius of cone A and B, as it is not the surface area we need to find it but the base area. The formula for finding the radius with the base area is
, but we also can't find the base area without the radius (which we are solving for). I don't want to leave this question without some sort of answer, so I'll be answering as if the base area of cone A is 5 m² and the base area of cone B is 7.2 m².
Using the formula, we can solve for the radius of both cones.
Cone A


Cone B


Giving us the ratio
. However, our answer must be given in the form of
, so we have to divide both sides by 1.26.


To give us our final answer, 1 : 1.2.
I apologize if this is wrong, as I still think it isn't possible to find the radius of cone A and cone B without the base area. If someone else does know how to solve your question with the information given, I hope they're below my answer.