Answer:
Equation I: C=2*3.14*r
Step-by-step explanation:
A linear equation is an equation whose highest exponent on the variable is 1.
C=2*3.14*r.................Exponent of 1
A = 3.14*r^2...............Exponent of 2
A = 3.14*r^2...............Exponent of 3
