Question

What is the radius of a circle with the ratio 1:4 when the smaller one is 12cm​

Answer 1

Explanation:

1:4

12:x

1=4

12=x

cross multiply

x=4×12

x=48

Answer 2

48

Explanation:

1 to 4 = 12 to ?

multiply the small one by 4 to get the bigger one