Answer: 1. ![C=2\pi r](https://tex.z-dn.net/?f=C%3D2%5Cpi%20r)
Step-by-step explanation:
We know that a linear equation is a particular type of equation .
- It is an algebraic equation in which each term has an exponent of one.
- Its graph is a a straight line.
The given equations :
Here , variable = r (radius)
Since , the variable has exponent =1 , therefore it is a linear equation.
![2. A=\pi r^2](https://tex.z-dn.net/?f=2.%20A%3D%5Cpi%20r%5E2)
Here , variable = r (radius)
Since , the variable has exponent =2 , therefore it is not a linear equation.
![2. V=\dfrac{4}{3}\pi r^3](https://tex.z-dn.net/?f=2.%20V%3D%5Cdfrac%7B4%7D%7B3%7D%5Cpi%20r%5E3)
Here , variable = r (radius)
Since , the variable has exponent =3 , therefore it is not a linear equation.
Hence , the correct answer is
.