### Instruction: A wheel with radius $1\text{ m}$ is rolled in a straight line through one complete revolution on a flat horizontal surface. How many meters did the center of the wheel travel horizontally from its starting location?### Response: So the circle is rolling on a flat surface, so the horizontal distance traveled is equal to the circumference of the circle.
Right, and the circumference of a circle is $2\pi r$, where $r$ is the radius of the circle.
In this case, the radius is $1\text{ m}$, so the circumference is $2\pi \cdot 1\text{ m} = 2\pi\text{ m}$.