Question

Which of the equations listed below are linear equations

C=2 pie r
A= pie r squared
V=4/3 pie rcubed

Answer 1

`\large\boxed{C=2\pi r}`

Explanation:

A linear equation is an equation in which a variable is in the first power.

The formula of a Circumference of a circle

`C=2\pi r\\\\2,\ \pi-\text{numbers}\\r-\text{variable}\\\\\boxed{\bold{YES}}`

The formula of an Area of a circle

`A=\pi r^2\\\\\pi-\text{number}\\r^2-\text{variable in the second power}\\\\\boxed{\bold{NO}}`

The formula of a volume of a sphere

`V=(4)/(3)\pi r^3\\\\(4)/(3),\ \pi-\text{numbers}\\r^3-\text{variable in the third power}\\\\\boxed{\bold{NO}}`