Answer:
10.5 ft.
Step-by-step explanation:
1. Find the radius of the larger circle
4/7 = 3/r --> the ratio should be constant
cross-multiplication: 21 = 4r
Divide: r = 5.25 ft.
2. Find the circumference
Equation: C = 2πr
C = 2π*5.25
C = 10.5π ft.
